I have one and have had it on for about 6 years and love it. But they are really hard to get too. I'm not even sure they are still available. Ozzie, the guy making them, was getting up in his years and pretty much made them one off at a time. Maybe Brent at Newspeedmaster still has one kicking around.
I have only had to change the belt once and that was because I got a rock stuck in it and chewed up about a foot of teeth off the thing.
Kind of a PITA to swap out, but once you pull the swingarm off once or twice, it gets faster. I could probably swap the belt out in about an hour/ using the tricks I learned.
Installing the QPD belt drive kit.
