If you've always wanted a sit-stand desk, this is a great option. This desk riser sits on top of your desk and can raise your monitors to 19.2" high. It features a quiet electric motor with push button controls, and a two tiered design so you can keep your keyboard and mouse on one level and your monitors on the next. It has wire control, and chamfered edges to keep you comfortable.
Its dimensions are 32" W x 23.5" D x 19.2" H.