I installed it in a spare hard drive. While I was glad to see the reintroduction of the start menu, I was otherwise not impressed.
The use of a microsoft account to sign in is ridiculous and too much like "big brother"
I also dislike the tiles on the start menu. And performance doesn't seem that good (although it is beta)
Also, it contains a keylogger!
we may collect typed characters and use them for purposes such as improving autocomplete and spellcheck features.
I suspect W7 will be around for a long time like XP and maybe prompt more people to migrate to alts like GNU/Linux