If you read reviews you will see that people rate this kit highly. The nice part is that it looks OEM. I dont think that R4500 is alot for a quality speaker kit. Had it been available when I did my e36, I would have definitely gone for it. I just ended up swapping the old Nokia drivers for JL Co-axil units front and back. Same size so fits in the same enclosures, trick is to keep everything looking OEM and not to damage anything.
Most bad hack and slash in a car seems to be from crap sound installs.