If 10 is anything like 8 then no thanks, even at free the cost in frustration and mental anguish is way to high
It promises to be....different.
I’ve been following Win-10 since the first beta build. I loved it - it was quick to install, ran like a banshee, and didn’t look or act like Win-8.
The next build had problems (for me at least) with fonts and font rendering. I did like the Start menu well enough and most of the rest looked and felt like Win-7.
I’m on build 10074 right now and see that they went backwards with the Start menu - they made it look more like Win-8 (big stupid icons). The also eliminated the windows update link in the control panel. I no longer have any control over how and when I get updates. Being on a metered aircard, this sucks bigtime!
What is likely to happen is that Microsquish will make you an offer that (they feeeeeeel) you can’t refuse. They will stop providing support for whatever you are using in favor of whatever crap they want to foist on you.
As long as you have to start fresh you may want to explore Linux and Apple alternatives.