Summary: I'm no audio expert but to me these speakers sound clean with the Kenwood radio I installed at the same time. The factory speakers were blown (cranked 1812 Overture up a bit much) and I fried the front panel of the stock radio.
Summary: These speakers worked well for the first few months of having them, but then I started hearing some signs of one of them being blown while I had them hooked up the the 45W RMS that they're rated for (checked for clipping with O-Scope).
Pros: Fit well in a 1998 Grand Prix GTP, had to hot-glue the tweeters into the door sail (expected that with any component set I would've got). Sounded ok for a few months.
Cons: Poor build quality, poor sound field, rattling after less than a year on the 45W RMS specified that they can handle.
Summary: I installed these in my 1998 Grand Prix GTP today. I could not get the tweeters to fit right so I just hooked up the original ones and they sound great. The woofers sound so much better than the original speakers (from 1998).
Pros: Great sound, clear, nice looking, easy install
Cons: Could not get tweeters installed without drilling hole in door panel (Crutchfield said they would fit in factory location but they didn't fit)