Sorry, no help from me. What I can tell you is that I have held them and don't really care for them. The dial is kind of obnoxious to me, but in fairness, I am used to buttons. My other gripe is the finish, it is a serious fingerprint magnet. After playing with it for about 2 minutes, it "looked" like I had held it for hours. I did NOT actually put a tank on it though, so I have no opinion on how it works.
I really wanted to like it because I thought it would be awesome to get a couple of the charging bases, one for work and one for home. If it's just the size you are looking for, you could also take a look at the new IPV D2, eVic-VTC Mini, and the SMY 60w TC Mini, and many others. They are all small form factor competitors.