As for some other reviewers the non-stick stops working and it seems to sort of burn.  I foolishly bought three of these.  They were all good at the beginning but after a couple of months of regular use they deteriorated a lot and we no longer use them for anything we really need functioning non-stick for.
I haven't yet tried to claim on the guarantee but might increase the number of stars if they pay out. I'm guessing they won't since it's the coating.  I'm very surprised to see the number of positive reviews but maybe they're mostly written after only a few uses.