Alright, I bought this mouse brand new and at first I thought it was awesome, I love how I can be up to 100 feet away, it has really opened up me using my projector system instead of my monitor. However, the sensitivity levels should be put on the side then behind the wheel, to snipe I have to re-adjust my hand which is inconvenient. As with the batteries, I personally love the fact that it comes with two (woot no down time.) also, the batteries last me about 3 days, and I am on my computer constantly, I also refuse to turn off my mouse, so my mouse is constantly running. However, I really wish the drivers would have the option to disable the dead battery warning; I had to mod it with some third party software. All in all, buy this mouse, because it's the best out there and p.s. try to get the black checker board one, it's better looking and the material is more comforting than the show items plastic.