Over 7k on it; zero problems and I am not a stickler for maintenance and drive it like a 17 year old most of the time. Few hundred of those miles are drifting around and redlining it often.
I can't argue with how it's performed and lasted, still running piggy back and the Sling still feels like it has more power than I can use (at lease at lower gears)
Besides Bill being extremely busy, he does eventually get back to me, I have no complaints