CD-Drives ARE getting less reliable!
52x drives have been known to actually destroy the CD inside the drive! Its usually cheapy CD-R's that are made of a cheap kind of resin
they explode with a loud bang and kill the drive!
i wish i still had my old 12x SCSI SONY drive

that was my favorite drive
BTW the brand can make a big difference! i prefer Sony and LG
there is a drive that allows you to not only select its speed through software but also from the buttons at the front! its either asus or aopen...
you should consider the brand of drive you buy when you get one
ive had the best experience with sony
some drives are also more scratch tolerant than others!
got scratched CDs? if so you should know that some brands of drives will read those CD's - others wont