Had my watch on the charger, strapped it on, after 5 minutes looked down and was horrified that my $700, 14 month old watch had the screen flopping around.
Two months out of warranty, so when I took it in, Apply said I damaged it, dropped it or something but if you look at the picture the screen is not cracked, it just a clean separation. Apple said they could cover it if the battery was determined to have swelled but in my case it wasn't apparent. There is definitely a problem with these watches, when the screen pops off neatly like someone used a glass cutter it means there was uniform pressure to make it come off like that, could be gasses from the battery built up inside the stainless steel case or perhaps faulty thin glass. If you look at pictures of people who have actually damaged their watches it is cracked like a phone would, looks like a spider web.
This is mine:

Here is what a it looks like if you drop it (this is not mine):
