Vape mail! Been playing with my brand new rDNA40 since it came in, about an hour ago. Have only been using it down around 10-12 watts since I don't have anything good to top it with yet (wanted a Subtank, but needed something that would fire a Subtank before I bought one...at least this will work with my current toppers, even if it's only at the lower power settings; if I had bought the Subtank first, it wouldn't have worked at all with my ego batt.) Even after all the videos I had watched, I just was not prepared for how friggin' tiny this thing is! Shorter than my ego battery (650 mAh, twist) and just barely taller than my 510cc without the tank. And, small though it may be, it's certainly got quite a heft to it. It feels extremely heavy for its size. Holding this, after being used to an ego battery, is going to be like holding the ego battery after being used to regular cigarettes! My only complaint is something that has also been mentioned by others, and that's the buttons -- they don't exactly feel "cheap," but they are certainly a bit looser than I would like to see in a gadget that costs as much as this does. [Edit: Also, I suppose that I would like it if the fire button flashed like the ego does when coming in/out of lock mode, so I could know if it was successful without flipping it over to look at the screen. I do feel like this finish is gonna get marred up pretty easily, too. I guess I'd better get myself a shark skin to keep it looking nice.] Overall, though, I'm still pretty stoked about it. Hopefully even more so, after I get a decent tank to top it with.