The adapter itself is fine. But there are no instructions in the package -- I had to look them up online. After trying every possible way of attaching it to the monitor stand, I finally determined the screws that came with it were the wrong size. Product support offered to send me the correct screws, but it was easier to go to the hardware store and get them myself.
I put this on a Samsung Syncmaster and indeed the plate was too big to fit in the hole in the back of the monitor. I managed to screw it on so it was on top of the monitor, the screws were just long enough. I would have hoped the vesa holes would have screw wire for an easy montage, but it's just a whole so you have to work with a screw and bolt to get your vesa piece attached.
Works - screws seem a bit too long
Holds the monitor strong. Had to use different screws than were provided as they did not fit the adapter. Otherwise would have given 5 stars!
Fit perfectly and snug