this keyboard look great , and I love the feel of the key compare to most other keyboard . they be almost flat and require less effort and movement to press each key . the manually adjustable brightness on the key be a nice touch , as well as the built-in proximity sensor that only light the keyboard if you be near it . at first , I could not figure out how the automatic brightness be work . it do not seem to be work at all . but after read the `` get start '' guide , I realize that after you make a manual adjustment to the brightness that the automatic brightness feature will turn back on after 3 hour of inactivity or when you turn the keyboard off and then on again . I use my computer about 8-9 hour per day , and the battery be last about 4 day until I need to plug it back in to recharge . my biggest problem be that I forget to turn it off use the keyboard 's power switch to help conserve the battery . I think I be go to just drop the wire behind the desk and keep it plug in most of the time . it be nice that the keyboard itself have the led battery charge meter on it so you do not have to keep open the SetPoint software to see what the approximate level be . in the past , I have be able to use exist Logitech receiver any time I replace my keyboard or mouse -lrb- if I do not purchase both together -rrb- . but the new unifying receiver be only compatible with other unifying product . so currently , since I do not yet have a unifying mouse , I have two different receiver . not a big deal , but I think it be worth mention . you may want to pick up a compatible unifying mouse with this keyboard if you usb port be limit . this keyboard be stay on my desk . small issue aside , I can not help but give this one 5 star .