Product review (5 stars): Space saver
This item was just what I needed for increased work area on my desk. I wanted one wide enough for the mouse, which this is, with room to spare.  I also didn't want the tray to come out from under the desk so far that it was awkward to work while the tray was extended.  With this model, the tray only extends the depth of the keyboard. Plus the height is adjustable.  Good purchase!