I upgraded from an HTC incredible 2 to a black GS3 on verizon this past Saturday, and really like it so far!
I have the swipe to unlock setting enabled and pattern security setting enabled. Once I swipe to unlock, the screen dims on the pattern unlock page. The screen is usually set at 25% brightness, and goes down to 0 brightness on the pattern unlock screen. The screen then returns to 25% brightness once it is completely unlocked.
This is more of an annoyance than anything else, but has anybody else noticed this occur on their GS3?