I've had 3 WD drives fail of about 8 used. I've never had a Maxtor or Seagate fail (about 10 and 2 used, respectively), and I've had 2 for 2 Deathstars fail.
So now I stick to Maxtor or Seagate, although I'd probably try WD again since the drives I had that failed were 2 20G 7200 RPM and one 13G drive. All were purchased during the time when WD was having some problems that seem to be corrected now, if the forums are any indication. And I never had a problem with WD customer service/replacement other than being a little slow.
It's a crapshoot.