ive got an mx-1000 and dont worry about the weight, its not bad. the batteries charge on the dockign station and takes barely any time at all. leave it on when you dont use it, and youll never see the power level drop a bar. VERY precise. you couldnt pay me to go back to corded mice. only thing... when you install the software, change some of your button setting to "default" so you can use them in games.... and firefox. I personally think the weight is perfect. oh... also, get BFG teflon pads for the bottom. It is soooooooooooooooooooooo smooth.