I don't have one yet but I will probably buy one. I really wish they offered a version without the LED readout that would just use the MSD "pills." I have to assume that since you select the rev limit on install when powered, that if your batt goes dead or is disconnected, you have to reset every time. With the pills the difference from stock appearance would be very, very small, and if the car went unpowered there would be no issue.