I have an Envoy, too. I just got it in March with my new trailer. I got mine for $60. also. It works very well, although lately the trailer brakes will lock up sometimes after they're warmed up. I may need to keep experimenting with adjustments. It didn't do this on the first 1/2 of my 5600 mile towing trip to CA in June, but then it started doing it. It seems like it could be related to higher ambient temps, but I don't know. I'm new to the trailer brake game, so I don't have any frame of reference (had a pop-up camper up until this spring). It seem to be a pretty good unit, but I have heard some negative comments about Tekonsha. But I've also seen a lot of positive comments here about them, too. The trailer stops when it needs to and doesn't push me, so it is doing it's job. By the way, I mounted mine in the hole where the ashtray used to be. Very convenient for adjustments.