Great keyboard!

Having used a Microsoft Internet Keyboard for 8 years, the sidewinder feels simply astounding. While the keys are low-profile, they are not completely flat, so they are very easy to get used to. The red backlight really helps when typing in the dark, and you can even adjust it, since it has three levels of brightness, plus off. While I have read some complaints that the media keys work only with Windows Media Player, I found that to be false - foobar2000 responds to them perfectly fine. The macro keys are quite handy when it comes to gaming, though I personally haven't used them that much.
Of course, the biggest advantages this keyboard has over its competitors are the massive key rollover and the lack of ghosting. Again, while some have reported minor ghosting issues, those might have been present only in the older models, since I have not been able to reproduce ghosting even once.
I have only one serious gripe with this keyboard - the surface area is glossy, which means after a couple of hours of usage smudges and fingerprints will be visible all over it. Keep that cleaning towel ready, folks!
Another minor inconvenience that some might need getting used to is the fact that the Escape key is NOT at the uppermost-left corner - that one is actually the macro level switch.

All in all this is still a great keyboard and I would definitely recommend it to anyone that does not want to get a mechanical one.
My final rating is 9.5/10.