I think it might have to do with the series - 75gxp vs. 60 gxp or the older 34 gxp. I've had both of the latter two (the 34 was the OEM drive I got with my G4/500, the 60 I bought and installed myself based on all the good marks it got from users at XLR8). My 60 GXP has been the fastest, quietest drive I've owned and it was pretty easy to install too. YMMV but I think at a minimum the 60GXP series is known to be very reliable.
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Hooray for IBM!