The V3 is my first mod and I really love this thing. I use it with BE 510 HR carto's and my batteries last for a full day of fairly heavy vaping. I also have an Inferno, and use all 3 of them set up with my 3 favorite ejuices. The V3 is mechanical, and has a locking switch that is perfect for me. I highly recommend it.I REALLY like the looks of that line, I spent half a day reading up on them and watching reviews. My impatience is like a sickness though, not sure why that is.
Right now I'm eyeballing the prodigy v3.1 from puresmokers, seems like a lot of people are happy with them.