Now I am not debating which is better here I am in looking for a mouse to go with the sp3 and to make my mind up I want some info. I use wireless as 1) I hate wires, 2) hate plugging in and out. Currently using Logitech 602 for gaming and for the sp3 im looking at Logitech m545, small cheap and fits in hand/pocket/bag nicely. Normally blu-tooth is a terrible drain on battery or it used to be but the wireless dongle must use some power. So question, anyone got stats or feel for this. Obviously the priority is use the least amount of battery where plausible to do so. I be off to get my sp3 in a bit but will keep tabs on reply's to this.