I just got a Vamo a couple weeks ago and I love it. It doesn't seem like theres much another mod can do that makes it worth so much more. The Provari looks great but it's way too expensive. I'm looking at something under $100.
Hard to beat the Vamo for the price. I have been looking at the Innokin SVD however. Comes with two iClear 30s for $100.
I like my vamo, but I think of it more as novelty than anything. It's a China made mod. I would be extremely surprised if I get 6 months out of it. I got because it was cheap ($35) and I wanted to play around with VW. I put a R2D2 wrap on it as a gag and pull it out just as a conversation piece.