I was after a gaming mouse, but as a casual gamer, couldnt bring myself to blow £40-50 on a mouse. I decided to risk goign with this mouse, which I found at another retailers for under £20, and so far I am very impressed with it given the price!
First off the mouse seems pretty well build, no creaks or movement in the body. Fits in the hand nicely and all buttons respond very possitivley (bar the middle mouse button which is somewhat squidgy). Rubber thumb grip works well and is very comfortable.
The optical engine seems to track very well from the limited gaming I have done with it, right the way up to 3200dpi (although this does make the mouse excessively sensitive!). The adjustable weight feature is nice to have; in the base of the mouse sit 7 weights, which can be removed to make the mouse lighter.
The most impressive feature about this mouse is the software that comes with it. Having read very little about the Oscar software, I must admit I was very impressed! All of the buttons can be assigned different tasks; you can even create and assign a variety of Macros! Furthermore, once you assign the relevant buttons, you can download the configuration directly to the mouse, so if you ever need to take the mouse somewhere without your PC (LAN party etc.) you dont need to install all the drivers - just plug and play.
Along with this, you can adjust the responce time of both the optical engine and the mouse buttons (from 250Mhz-1000Mhz and 3ms-30ms respectively); why you wouldnt have it running at 1000Mhz and 3ms all the time is beyond me...but there you go!
So yeah, for the price its hard to go wrong. Lets just hope it stands the test of time!
EDIT: I have now been using this mouse for well over 4 years...and no problems to report. An exceedingly sturdy and well built bit of kit; I wouldn't hesitate to buy another one should this one break...although that isn't likely to happen any time soon!