What's being said about the Kenwood TrueX 52X drives is all true. They work _really_ fast...when they do work.
I bought one for $100; it stopped worked from overheating after 2 weeks of normal use. I sent it back to them, and guess what ? They drive they returned to me started to lock up the system at the end of the first day of use, with the same symptoms the first one had.
Such a pity, since when it works it's really fast and very silent. Kind of a lottery, really.