Hi. I want to upgrade my old logitech mouse for a better one, one that has more that the standard 3 buttons. I've been looking at the Razer mice for a while and found 2 i really like, and that fit in my budget: The Razer Lachesis and The Razer Deathadder Both have extra programmable buttons, but only the deathadder has official mac support. Does anyone use either of these mice? How do they perform and how easy/hard was it to configure the buttons?