I've gotten 2 of my 3 total oil changes in CU here, and I've been as pleased as you can be with an oil change - it either works or it does not, and these have worked. Their basic oil change is $27, but they offer $3 off if you show your university ID. The first time I used the place, there were 5 cars there for 3 service spots, so I ended up waiting around 45 minutes for my car (10:00 on a Friday; I expected more like 25 minutes since they could service 3 cars at a time). The second time, I was the only car there and I was in and out in 10 minutes, which was surprising for 11:45 on any weekday.
The only gripes I can think of are that although I watched them clean my car windows, there was still bird doo-doo on my windshield when they were done; also, the little windshield sticker that tells you when and at how many miles you should get your next oil change never wants to stay on the windshield in hot weather. Nice folks, good service. Minus one star for the combination of my initial 45 minute wait, bird doo-doo, and sticker trouble.