I'll try it, if only to source its vulnerabilities. Not in the computer security game anymore, at least not professionally, but I'm still interested. Plus, going white-hat can earn you good money and on a new OS there will be plenty of issues that can be found and need to be patched. I'll make a few dollars on the side helping to find problems.
Can't be any worse than Windows 8 from a user perspective either. The only reason I wont jump to it immediately is it will screw up the compatibility and play-ability of any Steam games that aren't optimized to run on this OS. Perhaps Microsoft has tried with newer games, but I doubt this will run anything older seamlessly. Windows 8 sure didn't. I've installed ESS: Oblivion (love the older Elder Scroll Games) recently, but getting it (and Fallout 3) to run on Windows 8 is a pain in the butt (too many .dll files needed to make them stable). I wont go through this issue again - at least not for personal use - until I can ascertain whether or not my PC games will run on Windows 10.
Can't say I'm too excited for this. It still seems to be too tablet oriented. When will Microsoft realize PC people want a PC interface and not the tablet side-swipe style one?
Those user demos are funny though. So choreographed, supposed to tell and show you the experience you can expect... except they don't!!! How the demo goes is nothing more that hype and the actual product ends up sucking more than what we were shown in the demo.
It's free, I'll buy a shell and upload Windows 10, but no way am I using it for personal use until its issues can be ascertained and patched.