Much I can not say yet, have the keyboard only for half a day. What I can say is that for my purpose on a HTPC, the thing is super useful. The range I tried to 6m and goes smoothly. The keyboard is also conveniently small and despite my thick finger goes the tap well. The mouse also responds well. The size of the receiver I have seen small, it is something like a USB stick, for me OK but on a notebook would be the already disturbing. However, neither the keyboard or mouse have a switch and the mouse also comes from not quite, it flashes after a few hours without using still in front of him - because I'm curious times the battery life. Therefore, only by 4 points if the battery life even true I'll score even increase or possibly even decrease.
So, the batteries I have not replaced until now (about one month), and it still works like new - so seems to be fine - 5 points :-)
