Regarding all the "Does this have a VESA mount" questions (since this comes up on every AOC monitor thread...):
The 23" (and very likely the 22" and 20") monitors have VESA holes in the bottom of the base, so technically they can be VESA mounted - several of the provided photos eve show the base folded up against a wall demonstrating this).
BUT: (and believe me, this is BUT is so big that Sir Mix-a-lot would be extremely interested...) the ability to VESA mount them is basically useless because:
1) The mount point is well below the monitor, so they'd be sitting up ludicrously high
2) The neck of the monitor is incredibly not-sturdy - your VESA-mounted monitor would be flapping around everytime somebody sneezed near your desk. I tried. It was ridiculous.
So YES, some of them are technically VESA-capable, but NO, you shouldn't bother with these if that's your goal.
That aside, the monitor itself is really pretty good, especially for the prices Woot's selling them for. We bought four of the 23" ones for my office last year through Woot and they all work great.