When I was researching the RBAs, I noticed several posts about the draw on the different devices, with some folks drilling out the air holes and so on. I also took note that some of them had a center air passage and others had their air hole on the side. Another variable on the side drilled airholes was the distance from the air hole to the wick, which I think does make a difference, but I'm guessing at that, because I don't own the different models to test them.
Since I'm an old ce2 user (now reduxes), early on I was looking at the A7 and Vision Eternity, as they both have center air tubes, and they were getting good reviews. I decided against the Vision because of it's coil mounting system, and I decided I wanted to try a tank system first, which ruled out the A7. I finally wound up getting the Gen 1 from COV. The reviews I read were mostly good, with the draw getting special mention on some of them.
I'm happy with this unit. The draw is perfect for me, the cap tightens up enough to not move when you stop it at the wick, and because the wick is mounted on the side, the air hole is close to the wick.
The thing is, it could be set up for just dripping. Just don't use the juice well, which would make it less wasteful to clean and change juices, less cooking of the juice and so on. True, you'd still have the unneeded juice well, but you'd still have the performance, plus one heck of a big excess juice collector lol. Won't appeal to everyone, but just something to think about.
Best of luck on what ever you decide.
