Not bad as supermarkets go, but SuperSol is much better. The only thing going for OpenCor is that they're open until 2 a.m. so if you're stuck after hours that's the place to go..
Don't even think in park your car in the parking. This guys are so smart that they put a post in the middle of the entrance and it's not even possible trough it with the car bigger than a Panda!