my brother'* 92 stock stereo wasn't too bad, but my mom'* 95 "premium" one sounds really really bad. Don't know what'* with it, but man, you can't get any any good bass out of the 6x9'* at all in it. GM should of kept the boxes that the 91- H-bodies had. Those boxes made the 6x9'* sound great. The only kind of bass the 6x9'* put out are a 'farty' type of bass. lol. it is really annoying. The front 5.25'* actually put out more than the 6x9'* do!
But for stock system, they are definately a lot better than a lot of cars out there.