Ive often wondered and had a little play on another drive yet fail to notice any benefits. I've heard some notice their PC running slower. I've also noticed Win10's annoying habit of not letting you chose which updates to install. Also any luck or failures upgrading 7 to 10 ? (keeping all your apps, settings, save games etc). How can you tell if your Win10 cd/image is an upgrade or fresh install version ?. I would want to upgrade not clean install hence need to be sure.