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Digiflavor Siren 2 GTA MTL Review: Flavor Above and Beyond

Robin Bartels
October 20, 2017

Digiflavor Siren 2 GTA MTL intro

I’m a mouth to lung vaper through and through. I was more than excited as the vape mail arrived with the new Digiflavor Siren 2 GTA MTL. YouTube reviewer Vaping with Vic also appreciates nice MTL tanks, and he helped design the Siren, along with three other reviewers. Let’s check it out!
Blue, Black, Gunmetal, Stainless Steel
Price: Discontinued

Note: The Siren 2 GTA MTL also comes in a TPD-compliant version. We received this sample directly from Geekvape/Digiflavor.

Digiflavor Siren 2 GTA MTL specs and features

Kit Content

  • 1x Siren 2
  • 1x Spare glass
  • 1x Allen Key
  • 1x Spare parts polybag (including different colored o-rings)
  • 1x User manual
  • 2x Coil


  • Height: 44 mm (without drip tip | 41.5 mm for TPD version)
  • Diameter: 24 mm (22 mm for TPD version)
  • Capacity: 4.5 mL (2 mL for TPD version)

Notable remarks



Unboxing the Siren 2, the first two things that instantly caught my eye were the matte silver finish, which looks great, and the drip tip. Yep, the drip tip looks kind of silly. The laser-etched Siren logo sits right on the build deck housing, and gives the atty an even nicer look. With the stainless-steel accents above and under the glass, and the little engravings on the top cap, it looks stunning. Taste is subjective of course, but I love the aesthetics, and I can’t wait to build on it.

Build quality


The overall build quality is good. The threading is very smooth, but one dry o-ring made a bit of a noise. The top fill cap opened very easily with a quarter turn counter-clockwise. It doesn’t feel like it’s going to pop off in the pocket. The AFC is also easily adjustable but also not too loose. Overall a 10/10.

Build deck


Now it’s getting interesting, right? Digiflavor decided to go with a very easy-to-build two-post style deck with a single coil. The screws on the posts are flathead screws. The slots for the wire are at an equal height, so when you build a coil, make sure that your legs are on the same level. The airflow comes from straight under the coil, lined up with the build. That, along with the proximity of the drip-tip to the deck, creates optimal flavor. The vapor doesn’t need to travel far to get to your mouth. The wicking slots are well milled and there are no sharp edges.

The airflow control


This AFC gave me everything I’ve ever wanted. Like the Aspire Nautilus 2, there are five different-sized airflow holes that you can open or close however you want, since there are no click stops. There’s also a single hole next to the airflow slide that lets you open the holes individually — or even just half a hole, if you prefer.

The Siren has something every MTL vaper appreciates: fully customizable airflow!



Let’s get to the performance of this GTA…

I used one of the pre-built coils that comes with the tank – SS316, six and a half wraps, 2.5 mm inner diameter, slightly spaced. It was nothing special, but fulfilled all my needs here. The coil installed easily in seconds. The build measured exactly 1.00 Ohm. I checked for hot spots, but the coil is so perfectly built that it heated up evenly without any issues.

Wicking the Siren, I was careful. After all, some GTA’s are spoiled princesses that just don’t want to cooperate. But there were no issues at all. I used Cotton Bacon, but any quality cotton should work fine. Push the ends of the cotton down to the bottom of the tank to get an idea where to cut. After cutting the cotton, give it a bit of e-liquid to make it easier to push the ends into the wicking slots. After screwing the chamber with the glass back on, it’s ready to fill with juice and vape. As a reference, I used a 50/50 blend with 12 mg nicotine.

Now, how does it vape?

I decide to work my way up every hole and then try the single hole options. These were my experiences:

  • Smallest hole open – Very tight draw, and warm vapor
  • Two holes open – Cigarette-like draw with warm vapor
  • Three holes open – The draw is still tight, but the vapor gets a bit cooler
  • Four holes open – Looser draw, with cool vapor
  • Five holes open – Could be used as a restricted DL hit

Trying the single hole options, I recognized a bit of a whistle when the holes are not perfectly aligned to each other, something I personally can’t stand. Overall, the single hole options are obviously tighter than having multiple holes open at the same time.

  • 1st and 2nd setting is not much different
  • 3rd hole gives me the same experience as having two holes exposed
  • 4th setting feels somewhere in between two and three
  • 5th is somewhere between three and four holes open

I had no issues at all with the juice flow; it wicked perfectly. There was no spit back, no gurgling, and no leaking, no matter what I did with the tank. The flavor is very good, as is the vapor production. You won’t blow huge clouds, but that’s not what a MTL vape is for.

Playing around with the wattage, I found 20 watts was my sweet spot, with two holes exposed. More power made it too warm for me, and less didn’t produce enough vapor. I also enjoy the drip tip very much. It seemed silly at first, but it turned out to be very comfortable in the mouth.

Note: Please make sure to not fill the tank with open airflow, and especially don’t overfill it with open airflow.


  • Easy to build
  • Easy to wick
  • Good build quality
  • Great flavor
  • Fully adjustable airflow
  • Good price
  • TPD compliant version available


  • High profile design (44 mm)


After vaping almost 8 mL of e-liquid in this tank — yes, that’s a lot, considering I used 12 mg nic — I must say I love it. I’ve tried a couple different rebuildable MTL tanks in the last two of weeks, including the Augvape Merlin Mini, and the Augvape Merlin MTL RTA. And, while it’s great to see companies getting back to making good MTL tanks, the Digiflavor Siren 2 GTA MTL is in my opinion the best one out there at the moment.

It performs consistently, and if your idea of a great vape is a smooth MTL that doesn’t require a $3 coil, the Siren is for you. Shout out to the YouTube reviewers who helped design this tank. Good job, guys!

Hi my name is Robin. A few years ago I was introduced to e-cigs by a friend. However, my first experience of vaping was with a very poor starter kit and soon after I went back to cigarettes. A few months later a colleague of mine recommended I give vaping another shot. Since then I have been completely smoke-free and love it! I am here because I don’t want people to have a similarly poor first experience with vaping. In my free time I enjoy gaming, playing football or meeting with friends.
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Vermon Discuss
Vermon Discuss
4 years ago

I would like to see more “initial thoughts” columns vs previews. Items already in the review process that are performing in an expililary fashion, but haven’t passed the litmus test of a full review. I like this site a lot. I’m a hobbyist though, and usually know about what you’re previewing weeks before. Sure, previews put more content on your site without a whole lot of work, but I feel like that info is already out there for someone who pays attention. I don’t care if you publish this. Just wanted to express my opinion and let you know I… Read more »

Jeremy Mann
Jeremy Mann
4 years ago
Reply to  Vermon Discuss

We totally understand what you are saying. It’s a little more complex than that, but still, we understand. Thanks for coming to the site! We really appreciate it.

I also sent a message to you.

✪ Shamz ✪
✪ Shamz ✪
4 years ago

Ughhh still waiting on mine ..

✪ Shamz ✪
✪ Shamz ✪
4 years ago

Flavor is ok I’d say, not above and beyond. I’m using a cotton strip that came with my Cubis Pro, so that might be it. I have some KGD and Bacon v2 cotton that I have to try as well. But so far, flavor is just ok with 26ga kanthal a1. I mainly got the tank to rebuild and save a boatload of cash. So far so good in that department! Ridiculously easy to build on.

✪ Shamz ✪
✪ Shamz ✪
4 years ago
Reply to  ✪ Shamz ✪

Tried cotton bacon, still meh and still popping. Will try a contact coil next and see if it’s any better.

✪ Shamz ✪
✪ Shamz ✪
4 years ago
Reply to  ✪ Shamz ✪

Ah! Figured it out. I was using kanthal – The flavor hit was a looooot more intense with 316L wire.

Jeremy Mann
Jeremy Mann
4 years ago
Reply to  ✪ Shamz ✪

Yeah, stainless steel is always a good choice. Good to know you got a better vape with it. Hopefully that helps someone else.

Happy New Year!

2 years ago

Shall i go for Augvape Merlin Nano or Digiflavor Siren 2 GTA MTL 24 mm(4.5 ml) in Dec 2019 for best flavor and maybe cloud production?Everyone says Merlin Nano is best but i couldn’t be sure about Bottom filling situation.Does airflow adjustment situation have a plus for Siren 2 GTA over Merlin Nano?

Spyros Papamichail
Spyros Papamichail
2 years ago
Reply to  John

Hi John, and sorry for the late response. The comment came right before Christmas and was buried under a ton of other comments. I haven’t tried the Merlin Nano, so I can’t talk about it. But while the Siren 2 was one of my favorites for 2017, it has started to show its age in 2020. In my opinion, there are better MTL RTAs out there right now. My personal favorite in this price range is the eXvape eXpromizer V4, followed by the EHPRO/NatureVape True. I’ve also heard great things about the Hellvape MD, but I haven’t tried it yet.… Read more »

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