don't think i've seen a lot of folks with a lot of problems -
there has been the hyper-ventilating over a non-issue, ie the death grip kills signal bars - suspect the next complaint will be the phone loses signal underwater
other than the gps issue some are having, the others seem to be odd software issues, ie alarm doesn't work, something doesn't sync, but nothing i can think of that is common to a good number of users like the gps issue
PS - just remembered, the Kies sync issue, that one does seem common but don't think it's the phones as much as the kies software - i haven't tried it myself, waiting for everyone to report it works and doesn't create issues
btw, mine is running 100%, GPS, compass, no lagging, everything normal