In looking for a new MMO mouse, my primary requirements were good build quality that should last at least 2–3 years, enough buttons to get by, and no wireless. As one of the few quality MMO mice not to use a 12-button thumb array, the Rival 500 has a memorable button layout so I don't usually find myself hitting the wrong buttons. The one niggle is the thumb button placement. I use a palm grip with wrist well back, resting on the table, and I've found the front two buttons to be barely reachable with my thumb. If you have a different grip or large hands this shouldn't be an issue but it may be worth finding one to try out before you buy.