The IGO-S, while a bit of a PITA to build, gives about the best flavor of any rda I've used thanks to its small chamber.
You think it's a pita to build? Interesting. I thought it was one of the easiest of all the little ones I've used. But it did take me a few tries to figure out that I needed to make one leg super short & 1 leg long so it fit properly in front of the air hole. HST I agree it produces awesome flavor because of the inner chamber which is why I love it. My least favorite of that size is the Phoenix. It just annoyed me no end lol.