Highly adjustable tray. It can be set up for a negative angle where the keyboard leans away from you, and the separate mouse platform can be tilted independently of the tray, which allows you to have a flat mouse surface with a comfortable keyboard angle. I strongly recommend a keyboard tray for most people with a permanent desk setup- it helps ergonomically, and even if you feel like you don't need it, it frees up a lot of desk space.
The rubber strips for the keyboard platform have worn off and the mousepad glued to the mouse platform has worn down significantly over time, but that's a few dollars of parts and 15 minutes of effort to fix up a $90 tray.
All mounting hardware included, including a standoff that helps mount the tray on desks that have thick crossbars (such as most common standing desks). Pick up only.