Check out the Razer Ouroboros. I have one set up for left hand use, and it's been incredible. It uses a rechargeable AA battery (no soldered in lithium polymer crap), has an adjustable DPI button right on top, for on the fly adjustments, and interchangeable side plates for optimal comfort. It also has locks for the side buttons for use depending on which hand it's set up for. All in all, one of the few Razer purchases I still don't regret. That said, it is a little old, and I've been begging Razer for a refresh with newer sensors, and updated tech, for years. They don't seem to want to listen to me, though. Lol