I have the ipv3 liVR and it's been pretty amazing so far. I had to choose between the ipv4,ipv4s, the snow wolf asMODus limited edition, or the sigelei 150w tc. At first I was really thinking about the limited edition snow wolf but I ended up going with this ipv3 liVR.
I am not let down at all. It does everything I want it to, goes up to 200w in kanthal(i'll never use that much lol), up to 50j for nickel, and 100j for titanium. Flush and straight spring loaded 510, super bright screen, easy clicky buttons, no miss fires, Touch sensor works but It's kinda gimmicky so I turned it off, battery tray is good and clean, and of course the door has absolutely no rattle. I believe the usb on the bottom is only for updates I don't believe it's a charge port.
Looks pretty good to. Not a bad choice at all.