cityrat
Unless you have the "pro" version and can control your updates - upgrading to Win10 is basically agreeing to be a beta tester.
 
MS is allowing corporate customers to defer updates - the testing is first done with a smaller group, then "rolled" out to all those upgraded Win7->win10 "home" users.  Beta testers.  That's why it's "free" - you get what you pay for.
 
No thanks.

 
The situation is no different whatsoever from when earlier versions of Windows first came out if you stick to the default (2000/XP/Vista/7/8.0) on home or whatever. It's always taken 6 to 12 months for new Windows versions to stabilize. Windows 7 and 8.1 took less because in effect they were paid service packs for Vista/8.0.
 
With Pro you just have more options to choose from, I've always bought the Pro version anyway I strongly recommend upgrading.

I absolutely sympathize waiting until just before it no longer becomes free, but basically whether you like it or not hardware and software support for Win7 will, almost suddenly, get cut off one day.... maybe sooner than you think.

bitSync
What incentive do I have to migrate to Win 10?  

I know I'm a bit late to the party here, but we've actually published a few blogs explaining the more technical reasons you'd want to upgrade to Windows 10:
 
SONAR Performance Benchmarks using Windows 10 (spoiler alert: Windows 10 wins)
Windows 10 Enhancements for Music Production (an in-depth look at what has changed in Windows 10, and how it will affect the computer's performance as it relates to music production)
What Windows 10 Means for Music Creators (A clean list of improvements in Windows 10 that are relevant to audio, plus a few short videos from our CTO, Noel Borthwick)
 
I hope this helps! I made the switch myself just last month. While your mileage may vary, I've noticed a drastic improvement in the machine's performance.

Using a 32bit install I managed to get my available memory in Widows7 to 3.2GB. After the upgrade to Widows10 I can't get it above 3GB. It's not a great difference but there are a few projects in Sonar that won't run now because of that loss of 200MB. It means the culling, or replacement of a few VST's to get the projects to run. My only other issue is that the computer now seems to take anywhere from 2 to 10 minutes to perform it's housekeeping after bootup, and Sonar is unusable until it settles down.
Mostly I'm happy with Win10, it does seem very snappy, and with very little effort, everything runs smoothly, including Sonar.
I've forked out many, many thousands of dollars on instruments and my studio, so I'm not too worried if I have to upgrade to Win10 pro, or even enterprise, if it means I can close any privacy concerns in the OS. I do think there are probably programs on my computer that are of more concern regarding privacy than Widows though.

You probably can't upgrade to W10 Enterprise.  I think it's dumb MS went the distro way for the everyday consumer.  

I'm worried the FSF might hack into my machine.. Looking at this it might have already....

Personal Privacy = Personal/Private Power. Do you show your hand to everyone in a poker game? Do you give the enemy the exact coordinates of your position for their artillery on a battlefield? Win10 is a data miner pure and simple. The bigger question is why do the powers that be need to know everything you do? The answer is the same as it's always been = Money, Control, & Power. Why? Because the powers that be are paranoid of what they don't know. It's not rocket science, it's human nature.

So are all OS's.. Even previous Win versions. If you disable all the Win10 functionality that intrudes on your privacy you will be as safe as running on Win7. Anyway has been covered before in detail. Loop....loop...loop..

And it gets even worse:
http://www.forbes.com/sites/gordonkelly/2015/11/14/microsoft-windows-10-threshold-2-problems/
 
The insanity of automatic updates has reached the point of clear stupidity.
 

Reason # 385,028 to hate Windows 10

4 machines networked together. 3 -W7 Pro, 1 -W10Pro

After the f'update 2 machines could not access shared drives in W10 machine. It would require a user name and password.

Turn off protected password sharing is always checked but W10 after updates just seem to ignore this. This was a quirk with W7 but the only problems I have is Advanced sharing settings seems to be broken in W10.
 
I might even like W8.1 over 10.

Doktor Avalanche
I'll write it another way...

Those upgrading within the free period take your time.

To those not upgrading within the free period...
When Cakewalk drops support of Win7 or Win8 for Sonar, because the latest Microsoft libraries force them to do so, much like when they had to drop Vista support, don't say I didn't warn you! Also please don't expect the wait for that to happen to be as long as Vista had.

Not only that your drivers and plugins suppliers will also be forgetting about these OS's.

Yup people are still running unsupported Vista (getting increasingly difficult I suspect) but we can't guarantee this scenario in future.

It's gonna be a few years at least, but this may happen sooner that you think (not like it was in the past).

Cheers..

I seriously doubt support for WIn7 is about to stop anytime soon! A lot of businesses were still using XP until recently, and I'm certain plenty are still using Win7 till the wheels fall off. Vista was a flop-because it had numerous stability and compatibility issues. Businesses simply didn't adopt it, which forced MS to quickly get Win7 to market.
 
This is an excerpt from a page I don't recall about XP... 
 

There wasn't supposed to be a Vista

It's easy to forget that when Microsoft launched Windows XP it was actually trying to change its OS business model to move away from shrink-wrapped software and convert customers to software subscribers. That's why it abandoned the naming convention of Windows 95, Windows 98, and Windows 2000, and instead chose Windows XP.
The XP stood for "experience" and was part of Microsoft's .NET Web services strategy at the time. The master plan was to get users and businesses to pay a yearly subscription fee for the Windows experience -- XP would essentially be the on-going product name but would include all software upgrades and updates, as long as you paid for your subscription. Of course, it would disable Windows on your PC if you didn't pay. That's why product activation was coupled with Windows XP.  END...
 
____________________________________________________________________________
 
They obviously changed the plan of course. MS, wants to avoid another die-hard cult of XP users when it comes to W7, which is likely one motivation for the free upgrade to Win10. The more people they can get to switch, without a need to buy a new computer or software, the faster they can get rid of Win7. A lot of people had the: Get Win10 BS installed on their machines in a underhanded fashion to support their scheme.
 
I think people should be more worried about what the future holds for W10 and how MS could easily cripple your system by making certain aspects a subscription at some point. What's in it for them to give you a free OS? Not being in complete control of updates should worry folks. I wouldn't be so quick to want to see Win7 retired!