I've had 3 of these Razer Naga mice. You may wonder why I would buy three. The reason for this is while the mouse is perfect for MMO gaming, the quality of the parts leaves alot to be desired. Every one I've had has ended up in the bin due to the same probloem. Either the left or the right mouse button becomes unresponsive or unpredictable, a nightmare in a game where there is PVP and your mouse suddenly clicks on a pvp-enabled player hanging with his other pvp-enabled buddied.. insta-death. That has happened to me a couple of times. Other than that, when you need good control of your character in a dungeon for example, the mouse can have you running in the opposite direction and it is a real pain. There are various youtube videos on how to fix these problems with the mouse but the solutions never last very long and sooner or later you'll be back to clicking on things you never meant to and not clicking on things that you do. The naga generally lasts a year, that's what I've found anyway. So while it's the best one there is in terms of playability, in my opinion, it is really, really let down by poor quality parts.