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John Gruber of Daring Fireball had a defective review unit:
The first unit I received from Apple seemingly had a hardware defect. Taps worked at first, but I found them surprisingly weak — so weak they were easy to miss, even with the watch strapped relatively snugly to my wrist. By the end of the first day, taps weren’t working at all. Apple sent me a replacement unit the next day...

If even the review units (which are presumably tested before they're handed out) are displaying hardware defects, that doesn't bode well for the actual retail units.
 
That is not going to stop posts claiming that there is light bleed. It is inevitable. So many people see things that aren't there. :eek:

On OLED screens, they can actually exhibit burn-in so people will be complaining that their watch face has burnt in and is visible on white screens
 
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