On my primary system, I have a dual boot Win 7/Win 8.1 (on separate SSD's).  They have the identical Sonar setup including extra add-ons such as Ozone 5, POD Farm 2, Antares, etc.  As it is now, I can use either and Sonar works exactly the same.  I'm going to upgrade the 8.1 to 10 when its available and start using it as my Production.  If there is a problem, I can fall back to the Win 7 install.  But, testing I've done with Win 10 Preview releases, I haven't run into any issues with Sonar.

There still will be major bugs upon release. There always is. Generally takes around six months for everybody's issues to be sorted. Been like that since Windows 9x and perhaps earlier (memory fails me).

slartabartfast
The insider version is available to people who do not have a licensed copy of Win 7 or 8.

This reminds me of an old adage that Microsoft seems to now be living by: Keep your friends close, and your enemies closer. ;)

The sky is not falling, Windows 10 works.
 
 
Have a nice day.

..for you! (And probably many others). Looks forward to pasting the usual complaint threads on here within the first month of release date. It's the same old story on every release...

Also note let's be more specific here, you don't have the final release installed... Last minute surprises often happen by design..

I going to be forced into W10 but so far I like it and don't have to replace hardware.
A couple years ago I bought 3 Windows Anytime Upgrades from a vendor to have all machines W7 Pro.  A year later that vendor was sued by MS.  They are gone. Some people have bought multiple licenses of Office from this vendor and have trouble getting 2nd activations. My WAUs happen to be OEM.  So with W10 I will have unquestionable licenses. 
 Windows 10 is great.  I haven't really messed with it as a DAW but everything opens up.  My concern is where everything else is at for tweaking. It's not hard to find.  You find your apps in the start menu. They are listed in letter order with a letter heading. You don't need Classic Start Menu.  I do believe it has virtual desktops. Contana is annoying when it says "search windows or the web" always does the latter.  Spartan is a dumbed down browser.
 It also has the same virtual machine in W8 Pro.
 FW devices work.  Legacy audio interfaces work with W7 drivers.
 
 My only concern is backward compatibility on games.

Compatibility seems to be a pretty strong point with Windows 10, I haven't found anything that doesn't run well yet, but I'm not a gamer. My concern is about basic stability. I'm on build 10130 right now, which is the latest slow ring build and there are still some fairly rough edges, particularly with Hyper-V which I use a lot. Still haven't been able to make it work and have had to use system restore points more in the last week than I ever have to recover from issues with that.
 
My machine is pretty powerful but it's an aging machine and I suspect that the issues I'm having are related to some niggling hardware incompatibilities. It's the edge cases that a new release typically has trouble with, but I still have hope that the major defects are ironed out before ship.
 
Like I said, Sonar Platinum (Everett) has been rock solid on 10, a real bright spot for me throughout the Insider program.

Doktor Avalanche
You have every right to be nervous. I personally would not touch it with a barge poll on my DAW installation until new year. Major bugs will be ironed out and driver support will be much better by then.

I don't believe there have been any major driver model changes in 10 but I could be wrong, perhaps video drivers supporting DirectX 12 maybe. I suspect that most issues folks will have will be installers that fail due to OS version checks.

I love Win 10 too! I've been using it as primary os since november and tried it in Virtual machine even earlier. think it was at the launch of 10 preview. I've been , editing and mixing on it and it has been stable all tone way. I am on the fast ring as well. I think the next updates will be more of security and bug fixes than features updates.
I tried the latest one for Windows phone too. But it lack some futures I need so I reinstalled WP 8.1. looking forward to the next one that should come in July. 

@Kevinwal I spoke to Focusrite apparently saffire drivers will come for windows 10. Not sure if windows 8 drivers will work or not maybe somebody can confirm. So it seems that ASIO drivers will be released esp for windows 10 although Win 8 drivers are likely to work. There may be a few hurdles to overcome.. Anyway I don't think it's a cert all drivers will work, certainly you shouldn't assume it will..