I have Sonar Home 6XL 64bit installed.
Toying with the idea of upgrading to Windows 10.
 
Has anyone had any issues with Sonar after upgrading to 10?
Have all your soft synths worked OK too?  (I have some MOTU ones, and some Cakewalk ones).
 

Nothing has misfired for me since upgrading to Win 10 64bit using SONAR Platinum 64bit.

So far everything has worked for me. I did have to reauthorize AD2 (hard disk authorization) and Valhalla VintageVerb (keyfile which was in my program files folder). Also two programs were disabled because they weren't compatible, and I reinstalled my FireFace drivers. Oh and JBridge complained about permissions but I found I didn't need it anymore anyway because the only two plugs I used it for now have 64-bit version. Other than that, it was completely painless. Kudos.
 
For reference, I have Komplete 9 Ultimate installed, lots of AD2 stuff, a bunch of other 3rd party synths, a Waves bundle, FabFilter bundle and a few singletons. 

Only been on W10 for a few days, but so far the experience has been flawless.  I did this at the same time as updating my soundcard to an RME one which gave me some problems (related to the USB port rather than the OS).  There's a few changes to the UI which will take a bit of learning, but otherwise I'm happy.
 
Some older hardware may not install due to the enhanced driver signing - but again there are workarounds to this if you need them.  There's also the general worry about it sending all your activity to MS - you can turn off items that it advertises of course, but it might still track stuff covertly.  Doesn't worry me tbh.
 
<EDIT>  I'm running a bunch of VST/VSTi including Omnisphere, AAS, Kontakt, Arturia, EZD.  Also Waves Gold pack and the Waves SSL 4000.  All working good.

Other than a couple of re-authorizations, everything is running better for me with Win10Pro x64 over Win7Pro x64.
 

Everything I have seems to be working fine under W10, including some ancient ones that predate Win7.
 
Which is what I expected. A plugin, after all, is running within a host application and mostly dependent on the DAW's features rather than the O/S. One possible exception would be a plugin that calls the C++ runtime library - which many do - and depends on an older version to work properly. I've heard of such situations, but never encountered them myself. The C++ runtime is generally backward-compatible. 

Hi. I upgraded to Win 10 the day after it came out. And I am very happy that I did. The only issue I have had is a Windows update that screwed my Tascam FW1884 up a bit for a while. Did have to re register AD2 and Melodyne though. Other than that all is well on my end.
All the best.

Funny, Melodyne didn't complain for me but AD2 did. But maybe they do like a monthly check, it's only been a few days. 

I wish I had upgraded to 10 sooner than I did.

So who did an upgrade vs. clean install.