I bought one of these to replace my cheap tiny logitech not long ago and thought i'd post about how amazing this thing is for gaming. It cost me $20 and while I haven't tried any of the Razer or SteelSeries mice, I would put it up against them. It has 4 DPI settings built in and a button to toggle them. I was also skeptical about the little thumb rest, but it is probably my favorite part. It is wireless (though there are wired versions) and I don't believe it's using bluetooth as most of the Razer wireless mice do, but for $20 i'm not going to complain.
[VIDEO]http://www.amazon.com/E-3lue-E-Blue-2-4GHz-Wireless-Optical/dp/B00DPC015E/ref=sr_1_1?ie=UTF8&qid=1395355534&sr=8-1&keywords=E-Blue+Mazer]Amazon.com : E-3lue E-Blue Mazer II 2500 DPI Blue LED 2.4GHz Wireless Optical Gaming Mouse : Keyboard And Mouse Sets : Computers & Accessories[/VIDEO]
Looks decent - I like the thumb rest (my Logitech MX Revolution has one - super comfy)