I think it has a 1million click warranty... Anyway, I bought this at launch and really liked it but ended up exchanging it for the Logitech G300 which I found to be more comfortable and more customizable than the D3 mouse.
However, I do miss this more matte finish and the glowing Diablo 3 lettering. At this price I might have kept it, but the G300 was half the price and felt better in my hand. I'd recommend it for sure, especially if you have a smaller hand.