I did an upgrade an there is one issue apart from having to.re-authorise Addictive Drums.

Independence Pro lost its activation. I have yet to resolve this due to no response from their support who need to add a new activation. This reminds me, I must follow up on this.

I did an upgrade as I didn't have the time (or inclination frankly) to go for a completely clean install of everything. Took about an hour including reboots. Omnisphere did require re-activation, but that product is so well supported activation took all of about 30 seconds.

I upgraded first and then did a clean install mainly as I was moving from 32bit to 64bit (upgrade at 32bit to register win10 then clean install of 64) I have had no issues at all, mind you I didn't have much in the way of old hardware to worry about. I did have to delve into it to remove all the user tracking *features* and have not bothered installing any anti virus software opting for standard windows security functionality.

I did an upgrade. I had no interest in a clean install since it would take me like a week with all the extra software and plugins. I would've stayed on 7 but I read so many good reports on the upgrade process. I have to say I wasn't disappointed.

Sanderxpander
I did an upgrade. I had no interest in a clean install since it would take me like a week with all the extra software and plugins. I would've stayed on 7 but I read so many good reports on the upgrade process. I have to say I wasn't disappointed.

this is also my experience :-)

Sanderxpander
I did an upgrade. I had no interest in a clean install since it would take me like a week with all the extra software and plugins. I would've stayed on 7 but I read so many good reports on the upgrade process. I have to say I wasn't disappointed.

My reason for upgrading was the programs and files migration also.
I think that now it's getting closer to a matter of sooner or later for windows 7 users, which I upgraded from.
Ran into the AD drums authorization snafu which was easily remedied by running the AD installer.
Go for it !!!

Re-authorization requirements are to be expected for some products when changing to any version of the O/S. That just tells you the O/S version is part of the machine profile used to generate the product's license.
 
I wish they didn't do that, but it's the way of the world now - you are assumed to be a criminal until you prove otherwise.
 
Just be glad those companies' authorization servers are still up and running. I had no such luck when it came to re-authorizing Adobe Audition. Fortunately, Adobe made a version available that didn't require authorization, but I've dealt with other companies that had completely disappeared, making re-authorization impossible.

Well I upgraded just now.
Disappointed to find out that both my Edirol UA1ex and UM1ex did not work. :(
But by God's grace I found a wesbite that helped me get 8.1 drivers working on Win 10!
Amazed and happy to find out that it worked.  
 
How to make Edirol Win8 drivers work with Win10
http://johnwarburton.net/blog/?p=25289

I bit the bullet on day one and couldn't be happier.

It's a very solid OS. My PC is nearly 5 years old and my Laptop is 6+ years old and they both run beautifully.