Pretty good review but you missed out some keypoints.
1. The Sidewinder X6 has smaller keys compared to other keyboards which needs some getting used to.
2. While the finishing on the Sidewinder X6 is not the best, it still lasted me more than a year without any chipping on the keycaps. Don't type with long fingernails.
3. I personally think that the volume and brightness knobs on the X6 gave it a rugged look that I really like. However, with the installation of the keyboard driver, it became too sluggish to use.
4. Anti ghosting feature on the X6 is bad so I won't recommend it for any rhythm gaming.

However, the X6 is a great keyboard to type on and in my opinion can only be bested by mechanical keyboards.