I've been using every build that I can get my hands on for my main OS, lol. 7000, 7057, 7068, 7077 and now 7100. I am completely satisfied with Windows 7 as my main OS. I had been running XP SP3 for a month or two after downgrading from Vista SP1 (this pc is old). 7 is by far and wide, the best OS you can have. Just be ready to reinstall a couple times with RC, RTM, etc, lol. MoZBackup is great if you use Firefox, Thunderbird, any Mozilla app I believe. Move all your linked folders to a 2nd hard disk. example: Music, Pictures, Favorites, Links, Downloads, etc. ALL of them that have the ability to move the location. This will allow you to install builds one after another, simply move the location once in 7 again, all your stuff is in the same place. You may have to give the 2nd drive a letter or change it after a new install, it varies. These two things alone make installing 7 so much easier. I'm sure there are more time savers and it would help if anyone else would like to post them.