I don't know if W10 will be the uber-OS they promise it'll be though. The newer Microsoft software won't support my older OS, so i'll have to get it either way eventually.
Well windows 8 back then was a significant power increase. My games would run nicer and the boot times would be quicker even on a normal HDD. But Windows 8.1 and the metro wasn't for me. W10 I know will have a slight power boost.