I got 2 of them from Vaporbeast (free shipping, although they're out of stock atm), looks great on my eGo Twists and works pretty good too. I really like these. Easy to fill, easy to clean, no long wicks to dry or worry about, no extra pieces getting in the way. Hasn't leaked once, rarely gurgles (I just wipe out the juice between the mouthpiece), and doesn't burn.
My one gripe however, is that it does not fit on my new PV (Versa/A606), it just does not screw in right or stay in place. I might try an adapter, I know I have one around here somewhere, but I can't find it in my mess of e-cig stuff. And I guess another thing... seems like the airflow for one of them has gotten tighter. I don't know what I did differently. The other one still works perfect. I have been rinsing them out (usually quickly with cold water, just shake and rinse a few times) so I'm not really cleaning them well but I do rinse.. dunno if that has anything to do with it.
But for the most part, I really like these, thinkin of picking up some more but I know there's always something newer and better (or at least worth trying till everyone finds something wrong with it) on its way. The price is good for the performance imo. So yea... before I order some more... is there something newer and better? I like my mini Novas too but I think I might like these a little more. I just really don't like dealing with long wicks. I guess top coil isn't my thing?