Has anyone tried a mastertune? I have a powercomanderV on my bike and my hd dealer can't get my bike running right. I called the guy I bought it from he directed me to an indy he knows. Says this guy is the best. This guy tells me get rid of the powercommander and get a mastertune. The mastertune reads the 02 sensors. The powercommander does not. He explained how the PC gets around the 02 sensors. I really didn't get it. He says buy this, run thier program, then ride the bike with laptop still attached. This will create a second program. when done the two will combine to form a custom map to this bike. I don't know about all this stuff. I then called the guy I bought the bike from and he said buy it, this guy knows his stuff. The mastertune costs about 500.00 he said buy it and send my your PC and I will pay you for the Mastertune. Sounds like I won't be out anything. Just wondering if you guys have used mastertune and what you think of it.