I ran one in my '13 Ultra only because I didnt want to have it mapped every time I changed an air cleaner or muffler. Problem one: If I pulled into a gas station, run in, get stuff, run out, jump on, start & GO, what happens is since it didn't 'map' the RPM's go up to 2600-2700 & STAY there. So I'm on a 30mph street not so bad but come to a light, you gotta find neutral quick at the stop, wait 15-20 secs & the R's come down to the 950rpm.
Now the 2nd problem almost killed me 4 times. Three times from either merging on to a highway, CRACK the throttle open to change lane & the motor dies to a 400RPM and there is NO throttle response. The cure is pull the left cover off after you shut it while parked. Pull the orange fuse out. Wait 5 minutes. Put back in & it resets the ECM. Almost clocked a car head on when going to pass. Merged, almost ran over by tractor trailer coming up my rear when it died to 400rpm. The last time the bike had a chance to kill me was June 6th when a deer jumped out in front doing 60. Went to brace holding on & crack the throttle to drive through it & it died again just at impact. Didnt lay the bike down nor injured but 17,868 damage to the bike so totaled.
Just bought a new '15 CVO RG so I'm hesitant to put THIS one on & kind of scared to try a new one.