I could not get it to fit following Apple's instructions. With the plastic scratch guards in place, the screws would not line up properly to engage the threads in the holes on the back of the monitor (and yes, I double checked that I was using the correct bits of plastic for my 23-in monitor). I removed the plastic scratch guards and replaced them with strips of folded paper and cellophane tape, and everything fit.
I am very happy with the monitor now that I can adjust the height. My neck and shoulders relaxed instantly.
I agree completely with the earlier reviewer who said that a $900 monitor ought to come with VESA mounting ability. I add that a $900 monitor should also have a HEIGHT ADJUSTMENT!
Frankenstein contraption, total pain to install, dodgy alignment
Written by Timothy B from Athens
I had to return the first one of these I bought because the milling was so bad that no matter how tight I screwed it on, the screws would never align on the sides. The adapter depends on the threads of one small bolt to pull the heavily-sprung mount out of the display and into alignment. The alignment has to be perfect to install the side bolts, there is no margin for error. What a headache.