When everything works, it is just great. But depends on the set-up, the USB channel may conflict with the (wired) mouse, so you can use either the numeric pad or the mouse, but not at the same time.
[This review was collected as part of a promotion.] Purchased the wireless keypad, my Lenovo laptop keyboard did not have one. Excellent quality, thin but has a little weight to it with grip strips on the back to prevent it from moving during use.