I have to second the VTR. Mine was purchased because of the need for something tough for out and about. The one point that kept drawing me back over other "rugged" mods, was the protection of the tank. Having it beside the body, with a ring to help keep it from breaking the 510 connector was a huge draw for me. Lots of tough gear out there, but the weak point is always the connection. This solves that. I looked at few others with the tank inside the unit, but just didn't appeal to me. Probably partially attributed to my state of shinyitis at the time. No regrets though, it's heavy, it works right every time, and I get amazing battery life. The battery life though, is because I don't go many places away from my home, and that's the only time my VTR really gets used. When I first got it and was trying out my tanks on it I was getting about 12ml though before the battery needed to be charged using PT2's and Davide's. I flip between an SVD and a Vamo V5 at home.