I've read a lot of complaints about the red dragon stuff. Ergonomics, quality, scroll wheel issues. Maybe there is a reason why they are so cheap?
Check out the Steel Series Rival. It has a wonderful sensor and works flawlessly and it can be had on sale around the $30 mark. Steel Series make very reliable products and they are my #1 brand of peripherals. The only complaint about the Rival is that the rubber coating may start to peel but it doesn't affect the mouse usage at all. I have one and haven't had that issue at all. I've had some high end $100+ logitech, microsoft, corsair, razer mice and they all eventually died. Mirosoft mice always had button double clicking issues. So far steel series has been a winner.