I loaded Windows 7 Beta on my production laptop - a nice upgrade experience, without any surprise. I had first to update my machine to Vista SP1 since it was a requirement to upgrade to Windows 7; I have been running Windows Vista 64-bits on a Dell Inspiron D820 since 2007. It is noticeable the improvements in performance; Windows 7 really delivers on the promisse to be a lighter operating system even when upgrading from a previous version.