I own 3 40Gig IBM GVEs (5400s), no problems. But, I believe all the reports of the GXPs having problems as I've seen several IBM SCSI ServerStar drives fail on two different rackmount servers in the same week.
IBM drives are usually pretty reliable except for the GXP line...I wonder if the ServerStar drives we had fail were made in the same factory or shared the same failing component?
IBM probably knows the answer, but knowing them, they're not going to public announce that they screwed up when they made a few million hard drives...