I used the Boge Leo, which appears to now be made by Innokin, or Innokin is part of Boge. (never quite clear on that). It was good, but a little clunky and I wanted something with a clip on the cap.
That lead me to the Lea, which was a great idea, but the tank attys it uses just didn't have enough life.
Then it was the Lea Kross, which I'm using right now. It works extremely well (although I'm really hard on the switches because I take really long drags) but the the cartos are not quite doing it for me and I'm looking to go back to a tank system.
This is the one I pre-ordered. It uses tanks, and I think the VV may really help to overcome some of the minor issues I've had with other tank systems. Plus, it just looks great IMO.
I really wasn't planning on switching, since overall I've been happy with the Lea Kross, but one of the guys at work mentioned that provari was coming out with a 'mini.' Which got me intrigued. Suffice it to say that their idea of a mini, and my idea of a mini, are two very different things. But, that lead me to the itaste, which I probably would have ordered faster if I hadn't spent a few minutes wondering if I could stomach a product with such an idiotic name. lol