I know of a couple of people that run them, you don't have to mess with timing or afR, you set in a base map and then with the wideband o2 sensors in the exhaust all the time it tunes as you ride.
Both say they work great, and a friend just bough the kit for his 08 softail
call Phil at
Califorina Phils in KS, he has a great price on them good discount, tell him I sent you so I can get my points for a free KS Ball Cap LOL