I used the Microsoft IntelliMouse Optical for years until I discovered the SteelSeries Sensei. It is a gaming brand, which means you will have useless lights on it but it still has the symmetric design like the IntelliMouse and has additional buttons on each side that can be remapped with the (not soooo bad) driver software. Tangential, but I can't understand how left handers can be neglected by peripheral hardware makers this much. Do they assume that just EVERYONE uses the mouse with their right hand?