I love this under mount unit. It was easy to install. Just mount guide frame first for hole alignment check. Then remove guide frame, install arm to frame and remount mount under desk. Then install key board guide why sitting in your desk chair with 4 easy screws. It solid and sturdy. You can adjust the height of the board for your fit. An added feature (which I did not realize when I ordered it), you can rotate the key board either direction (pivot point center). This has come in real handy several times in the short time of my use. I wish I had done this earlier. I didn't realize how much more comfortable of typing at below desk top level is. The pad that comes with the board is a nice feature comfort feature. I would buy this unit again and highly recommend it.