I bought the 7137 before this one and it took me two hours to put it together. When I got to putting the keyboard tray onto the rollers, the screw holes didn't like up and I had to send it back. I ordered this one and it took me 5 minutes to put in four screws and I was done! Very sturdy tray and just the right height. Keyboard and mouse fit comfortably. Only reason I didn't give it a five is because the rollers are plastic and don't move as smoothly as the metal ones. But it's perfect for what I need.