Installed the Range in my truck because I was getting tired of the truck constantly dropping into V4 mood and it felt like it couldn't get out of its own way without having to put it to the floor. I noticed an immediate difference after the installation my truck is getting better fuel mileage and noticed much better throttle response.
Almost a year with the Range AFM Disable Device
Almost a year with this device and it has worked well, when it works. Today I was in town and went to start the truck (2013 Sierra) and the lights came up but the engine wouldn't turn over. Tried 4 or 5 times with no luck. I also noticed the information panel read "SERVICE TRACTION SYSTEM". I unplugged the Range device and it fired right up, though the check engine light was now on. I drove down the road (20 miles or so) and the check engine light went off. Be aware before buying.