When I got it I got it hooked up I did everything it was supposed to do but where the computer plug goes into the ECM it was chipped. So you can tell it was an older unit. I hope I don't have problems in the future with water getting by it.
ECU arrived packaged well. ECU looked like it was new even though they are reprogrammed unit. After installation, I followed relearn procedure provided with the ECU. Vehicle started right up and has been driving fine. Hopefully, I will never need to purchase another ECU for my 2005 GMC Safari again. But if I do, I would purchase from Autocomp Technologies again.