My razer mamba 2012 has terrible battery life, almost every day i have to use my logitech mx performance mosue because of that. My mx performance is a bit to heavy and does not have dpi adjustments(other then that it's a verry good allround mouse for me). I would like to have a wireless mouse, with good battery time, and fast charging time (if it's a rechargeable battery), dpi adjustmnent, thumb button (forward and back) and god comfort, once had a steelseries xai, i got pain in my hand after less then one hour of playing crysis 2. Max price not more then about 50 euros. Is an Asus GX810 a good mouse? It uses 3 aaa batteries and cost's just under 50 euros in denmark where i live.