Is flaky with Vista....8 is fine, so no great loss methinks. The update manager in 7.5 played havoc with my new PC, constantly trying to download updates that were not there, popping up with messages all the time etc.
Before I upgraded to 8, I had to slow the system down via the BIOS, boot, update 7.5, re-boot, set the BIOS up for full throttle and carry on! 8 has no such issues, and the interface is far better. The "upgrade to paid version" note is annoying, but you can't really blame them for that....It even sits happily with PC Tools Spware Doctor.