Yeah, I have. So far 1st tuner was defective, 2nd tuner will not build tunes although it recognizes vehicle. Approximately 2.5-3 hrs on phone with tech support, and 1 day waiting on engineering to find a solution. Completed mechanical AFM delete Mar 6. today is Mar 11, and still trying to get this thing tuned, and out the door. 11.5 hrs to tear down and replace cams lifters and all gaskets, fluids, and 6 days (at close today) trying to have tuned. I normally send ecm's to a guy and have tuned for $50 +shipping, but it takes a week. LOL! should have just stayed with what worked. this predator x was well over $50 and it isnt any quicker so far. close of business today it is going back, if engineering hasnt remedied.