They are doing it very slowly. Two of my computers are now upgraded to Win 10 and my third has the upgrade reserved but is not yet able to upgrade.

I am guessing (I do that a lot) that as they upgrade everyone in small groups they are fixing the problems (bugs?) the previous group had. I cant recall an upgrade ever going this smoothly, I am not that lucky.

Some people are having trouble.
http://www.theregister.co.uk/2015/08...crosoft_doing/

Though in the above link its saying a few bugs with people who bypass windows update to avoid compatibility checks. Not sure why they would consider that Microsoft's fault. Here is one quote
Windows 10 is usable then; but it is the buggiest new release I can recall.
That's the opposite experience I am having with it.