I had one but returned it, I picked up mine the week they came out, install was super easy and noticable power increase, but the damn surging in the MDS off modes drove me nuts. Tech Support at the time had no answer for it, but I assumed it had to do with the computer and Pulsar not agreeing about MDS. I was also questioned the relearn process of the ECU, I constantly fidgeted with setting trying to rule out the surging because Tech Support said there was no relearn, this gave me other drivability issues.... over all I would give it a 5/10 only because surging in MDS OFF settings. If I could pick one up for $250-300ish I would put one back in and leave it in setting 5.