Excellent product overall.. great feeling keyboard. Mouse works great... Did not need to install the software... worked right out of the box... Nice quiet keyboard with great feel. Excellent quality construction and the usual Logitech build. I cannot comment on battery life, since I have only had it a few days, but anything would be better than the non-Logitech keyboards and mice I have had in the past. For everyday work, the keyboard has all the features one could want, except no light for CAPS LOCK or NUM. That is the only downside to the combo. Mouse is very responsive and works even held against cloth. Do not panic if you have only USB and no PS2 plugs on your computer; you see only one USB adapter for one of the PS2 plugs... it only takes one usb connection for both keyboard and mouse to work fine. I did not even have to use the reset buttons when installing. Outstanding Logitech product. This setup is replacing a nightmare keyboard and mouse combo with a very uncertain mouse ball. It would be good for media center control only. I was concerned that the mouse was separate with this setup, but being able to use the mouse on the sofa seat without problem ends my concern completely about not having an all-in-one unit.