Charging and mouse for me. I suppose I can use a wireless mouse but all the ones I've tried that don't have a usb dongle seem so jumpy. Bluetooth doesn't seem ready for that frequency yet.
I've been using Bluetooth mice for a long time and have never experienced any jumpiness. Currently I'm using a Microsoft mouse, but I used a Logitech one before (they seem to have given up on Bluetooth though). Neither has given me any issues on my MacBook Pro.
If the world could standardize on Logitech's wireless keyboard/mouse stuff, I'd be pretty happy. I've pretty much stuck to Logitech exclusively lately for my mice (I'm particularly fond of the M570, having been a fan of the similar Trackman Wheel), and I have several K570s (one Mac model for work, plus a couple others, including one in my living room for me to control an entertainment-center PC from my couch / coffee table).
I've found Logitech's implementation to - for whatever reason - be the best implementation of wireless peripheral communication I've ever encountered. No problems, no jumpiness, no nothing. It can't be that hard to build the equivalent to their dongle directly into, say, a laptop or tablet, can it?
I've been using Bluetooth mice for a long time and have never experienced any jumpiness. Currently I'm using a Microsoft mouse, but I used a Logitech one before (they seem to have given up on Bluetooth though). Neither has given me any issues on my MacBook Pro.