It may be premature because I've had these for less than 24 hours, but these are my first impressions. I ordered four of them and filled them with the same flavors that I have in the four Leos that I always have going. First of all - I couldn't get 5 ml in there. 4 1/2 is really pushing it and that is to the maximum capacity. You're not really s'posed to fill 'em to the max. The first several hits were WOW flavor and vapor. Almost too much vapor. I'm used to drawing slowing on the Leos. With these, the vapor is so abundant that you don't want to draw slowly or you'll burst a lung - lol. The odd thing to me is: Now that they are only 3/4 of the way full, the flavor has lost its richness. It's muted now for some reason. Also, the draw always feels like the carto is flooded. I'll give them more time and report back. It'd be great if we could hear from others that have these.