10 is OK... I run it on most system... Much better than 8.1
However, there are some hoops to jump through with it. It is actually 2 upgrades. From current OS to Win10 then at some time later, from Win10 to Win 10 update 1511. That is why I am saying no now for current system users. If you are good w/ managing system images and have patients, go for it.