For my desktop computer at home - I see no point in using wireless KB or mouse. They sit on my desk, computer alongside it. And after going through 2 Logitech wireless mice, the first of which ran down a pair of AA batteries in less than a week, and the second replacement one (free - because the scroll wheel stopped working in the first one while still under warranty, so Logitech sent me a replacement, a different model because the one that failed was no longer produced), I went back to a wired mouse, and the current one (also Logitech) I've had for or 7 years now.
On my laptop - well, I had a nice Logitech wireless one, complete with the same fancy scroll wheel as my desktop one, the ones that are metal and you can have it either click or freewheel. That lasted all of 4 months before the left click stopped working. Supposedly an easy fix by putting a dab of CA is just the right spot to depress the tac switch inside, but the heck with that. It didn't have great battery life anyway - better than that first desktop wireless one, but not great like the old Microsoft wireless mouse I had. Since I was in a hurry (can;t STAND track pads, even the "high quality" ones), I picked up a cheapy wireless mouse at Walmart, I think this was under $14USD. That was 4 years ago, and while a couple of the slippery pads on the bottom have fallen off and been lost, it still works great. A pair of AAA batteries lasts for months, and the thing really works down to a low cutoff - I mentioned this mouse back when the Batteroo debacle was in full swing. Once it stops working, no load (standard hi-z voltage setting) measurement with a multimeter shows like .8xx volts. The only downside of this long battery life is I usually completely forget about it and then when it does die, I don;t have any spares in my bag.