My thoughts exactly... my old 6 stacker was a absolute night mare.
Hence why i gave it the flick and installed a JVC Deck, and still kept my controllers on the steering wheel, its one of those luxury you cannot part with.
But i believe the original decks do have problems with burnt CD's.
So yer if you get the chance, upgrade your head-units. And remeber JVC is the only type which allows you to keep the steering wheel controllers.