I've had no really bad problems with WD, but that's just my experiences. I did have one drive go bad, but I think it was all my fault. The return process, as you mentioned, was excellent. They have all their drives' serial numbers on file and can tell when the warranty runs out, and all of this can be checked out by you. It was a very easy return process and when they shipped it back they packaged it extremely well.
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Matt