Have had one on my Ram and Honda Accord for over a year, have driven a good 30k+ miles with it installed between both vehicles.
Only had a problem once in the Ram a few months back. Was driving down the freeway at about 80 doing the same commute I always do and throttle got all whacky and was not responding right, a light came on in the dash for the throttle.
I was not so bad where I was in any danger or anything. Hobbled home since I was close, turned the truck off. Started it back up and it was back to normal. Didn't even have to unplug it. Has not happened again since. Nothing serious that makes me want to get rid of it nor prevent me from putting one in another vehicle in the future.