I brought this for counter-strike source, and it's really great. I run it at 2000dpi, and that means I can turn the sensitivity right down in CS and still not have to move far, but more accurate than a low dpi mouse with high sensitivity.
There isn't much to say about the ergonomics apart from that I find it really comfortable.
The included software is pretty simple and basic but the mouse itself is great and for a lot less than what Razor charges for the same sensor in a different case.