I checked a number of text and video reviews of the Vaporesso Gemini RTA. I don’t normally do that before writing a review for a product I’ve not used, in part because I don’t want to be unconsciously influenced by other reviewers’ opinions. In this case, the Gemini RTA had no manual in the box — only a tiny card with a few drawings parts and construction of the tank — so I wanted to orient myself to setting up the tank. In every single review I checked, the Gemini RTA was compared to the Geekape Griffin RTA, either in passing or at length.
I don’t own the Griffin and haven’t vaped it, but apparently the Griffin has become the gold standard among RTAs this year. My review won’t put the Gemini up against the Griffin, because I have no basis for comparison. I will, however, contrast the Griffin to SMOK’s new TF-RTA, since I reviewed that tank earlier this week.
The Vaporesso Gemini RTA has all the features that have become standard on most current-generation RTAs:
Infinitely-adjustable air intake from both the base and top cap, with four air slots in both locations. Machining and fit are good, with smooth but firm adjustment by the rings that cover or expose the slots. Draw is adjustable from airy when the slots are wide-open to restricted with more resistance when the slots are closed off. I think the Gemini is probably suitable for mouth-to-lung inhaling with the tighter draw of closed slots, but I’m so accustomed to direct-lung inhaling now that I seem to have lost the ability to do MTL, so I can’t be sure.
E-liquid flow control via four slots on the coil chamber inside the tank. These are opened or closed by holding the base and turning the glass mid-section of the tank.
The build deck is spacious, with Velocity-style dual posts, each of which has a pair of holes for coil legs. Grub screws on the sides of the posts secure the wires, and the machining of the screws and threads seems solid and dependable. Vertical quad coil builds might be possible, but the deck is designed to accommodate dual coils.
I didn’t use the pre-wrapped 2.5mm diameter Clapton coils included in the parts bag. Despite the popularity of Clapton wire, I prefer the simplicity of 26-gauge 316L stainless steel, so that’s what I used to wrap my own coils for the dual-coil build. My build came in at 0.22 ohms, and I wicked the coils with Kho Gen Do organic cotton. I’m an old hand at making my own coils, but I’ve not evolved into complex or exotic builds. Simple spaced or contact coils have kept me a happy vaper.
The top cap is a two-piece unit. The bottom part secures the glass tank, while the top part with the drip tip screws off to reveal two large, wide slots for top-filling. That design works well, but I prefer SMOK’s swiveling top cap. No quibbles, though, as filling or topping up the tank with e-liquid was easy and leak-free.
Through the first two tanksful I vaped, the Gemini never leaked, not so much as a single drop during vaping. Immediately after refilling, some seepage occurred from the bottom air slots before the internal pressure equalized, but turning the tank over for ten seconds stopped that. For the most part, everything stayed dry as a bone. That doesn’t guarantee that the tank won’t leak in the future, but it’s a very good sign that impressed me, since it enhances the pleasure of using the tank.
With my simple build, I found that the sweet spot of the Gemini was at 45 watts. 50 watts was also good, but I sensed the limits of adequate wicking not too far off. At 60 watts, my build entered dry hit territory. I assume that my build and wicking are responsible for the dry hits at that power. I’ll bet the Gemini could handle higher power with more perfect wicking.
Vaping the Gemini at 50 watts was satisfying but not extraordinary. Again, that may have more to do with my build than with the tank’s inherent capabilities. Flavor was satisfying, while vapor production was good, if somewhat less than room-filling.
I liked the vape best with the air slots halfway open, because it intensified the flavor and thickened the vapor without constricting the draw much. The airiness of the draw with wide-open air slots (top and bottom) was fine, but flavor and vapor production were slightly diminished that way. As far as I’m concerned, the Gemini is primarily a flavor tank rather than a cloud machine.
I’d rate the overall vaping experience of the Gemini RTA at about 80% of what I get with the SMOK TF-RTA. That may be an unfair apples-to-oranges comparison, since I used the larger 3mm-diameter pre-installed Clapton coils on the TF-RTA, while I chose a simpler 2mm-diameter single-wire dual-coil build for the Gemini. In addition, I run the TF-RTA at higher power (70 watts versus 50). In essence, the TF-RTA wins because everything about it is bigger.
In a different contrast, coil sizzle was less audible on the Gemini compared to the lovely crackle I get from the smaller, mini-sized iCloudCig Moradin tank at similar power. (I reviewed the Moradin RTA recently, and I’m very enamored with that little tank.)
With a spacious deck that’s easy to build, simple top fill, minimal leaking, and very good performance, the Vaporesso Gemini RTA has much to recommend it. Overall, the Gemini beats the hell out of most earlier-generation RTAs.
For me, though, the Gemini doesn’t match the superb vaping experience provided by either the huge SMOK TF-RTA or the diminutive iCloudCig Moradin. Those two RTAs are amazing and my current personal favorites.