I have made my reservation for the update on my DAW desktop and laptop.
The laptop is set for automatic updates - it's my guinea pig. The desktop is manually updated.
For sure I will be making a full image backup before the install.
My situation is probably different than most of you. For me this is just a hobby, not a business.
But I was an early adopter of Win 8 and 8.1 and did so via in-place upgrade from Win 7.
I had very little trouble with that from then until now. I have not had to re-install Windows, ever.
I build my own systems. I volunteer at a local Senior Center to give PC Tech support and I see all sorts of issues all the time.
I feel very comfortable debugging problems and I want to keep abreast of the latest things.
I see no reason to fear this new OS update. It is in MS's best interest that it be a success and it will be a great boon to developers to have only one Windows base to focus on, although that may take some time.
The reservation process claims to have inspected my devices and found no issues.
There may be several 'Metadata staging failed' errors in the Event viewer for those who have MS check for device updates. MS will be updating device checks so I expect these to go away eventually.
Meanwhile, I keep checking
www.eightforums.com/for reports from beta testers.
This looks like it will be a pretty careful release.
Never before has MS allowed an update from anything other than the immediately prior OS version, so they have to be very careful to get this right.
I have always had lots of hard drives, partitions, and I have scattered bits and pieces of stuff here and there on various volumes for a long time.
That has sometimes been a source of problems in an update, but usually a regedit fix works.
I recommend Registrar Registry Manager from the makers of LatencyMon:
http://www.resplendence.com/registrar This is great for bulk changes of paths.
I have re-located all the user special folders, the pagefile and swapfile, temp files, internet caches, etc.etc. across the 14 drive volumes I use (I wish 10 did away with those pesky drive letters).
Not bragging, just telling you that the upgrade from 7 to 8 and 8 to 8.1 caused few problems for me, so I'm not expecting any more from 10.