This keyboard tray was super quick and easy to install, and is very sturdy. I love that there is a wrist rest and mouse pad built in so those don’t need to be purchased separately! I’m also really happy with the retractable headphone hanger and the small drawer.The slot for a cell phone is also a handy feature, although if it was a little longer then I could place my phone horizontally as well as vertically. It would also be nice if there was a hole in the slot for a charger cord to come up through the bottom. Both of those are not a big deal though, considering all of the features that are included. The product is very thoughtfully designed overall!It doesn’t retract under the desk but that isn’t a feature I need. The angle of the tray can be adjusted for extra comfort and to help avoid carpal tunnel. It’s very comfortable to use. I rarely leave reviews, but I am so happy with this item I really wanted to tell people about it!