I have the Axis and I love it. This thing puts out major power, more then you would ever need. I usually keep mine around 4 volts generating around 50 watts and that seems to be plenty IMO. I bought it at Liquid Vapor Lounge in OKC. However there are some down sides to this device. Being a VV device it has its limitations. But like I said 50 watts is plenty IMO. The other thing is that the negative springs are a little wonky. I had to do some straightening and moving for them to sit straight on the batteries. I still have to put a spacer in between the batteries to eliminate battery rattle and movement. Im not sure if they are all like that but the 4 I had to choose from at the store were all like this. Hope this helps. Good luck