I have 6020cs in the front, and 692.12 6x9 in the back. So far they sound excellent, much better highs then the OEM speakers. I have yet to replace the OEM deck, and install an amp, but when I do, Im expecting an even bigger difference.
We had a bit of a problem with clearance, for pretty much every speaker. For the fronts, we made about an inch wood spacer. The door panell protrudes slightly in the lower corner, but other than that it fits fine.
In the back, there is a plastic spacer holding the 6x9s up. We needed to do this so the trunk springs clear the magnet in the trunk...it just barely clears now, so we were lucky. To get the rear deck on with the spacers and the speakers, we had to sand down the plastic on the rear deck slightly so we could reinstall it.
The shitty thing is, the driver side tweeter has been pushed in. I got these online on ebay, and they were BNIB, but somehow someone pushed it in, and I cant bring it back up because the mesh is glued on.
Next on my list (check out my cardomain in my sig) is a DVD nav deck, and submerged amp and sub.