I bought this mouse without real conviction, but I must say I'm pretty impressed. Autonomy is just huge, I change the batteries every 3 or 4 months. Shortcut buttons to move forward or backward in web browsers are very useful and well placed (although it takes time to adapt), IPR + and DPI- are very useful, especially when I play or I lend my computer to a neophyte (which is not used to move a mouse with a high speed).
Very very good mouse for the price, I am still amazed!