There's a lot of talk about Windows 10 both good and mostly good, but some of same voices want to say something negative anytime Microsoft release a new product. Haters gonna hate. Having loaded Windows 10 for myself over the weekend, on a Surface Pro 3, it didn't take long, loaded correctly and runs flawless. The new design incorporates the webby Win 8 interface with the usefulness of the desktop for what I feel is the best of both worlds. If you're looking for tips an article by ExtremeTech.com has some hidden features and useful short cuts.
Most of the negative I have heard is about the privacy settings, but you can shut the data sharing off from the control panel or during the installation so it's really a mute point. Everything you do is watched anyway from the moment data leaves your box, so what's the point. (I still opt for leaving the sharing features off though.) The Windows 10 operating systems runs on most devices with the ability to sync between my them. And, when I go to upgrade my phone I just might go for a Windows phone to exploit these features. I'm happy with the free upgrade and the ability to write notes on a web page while viewing, then save it, is huge. Thanks Microsoft!
Why wasn't it called Windows 9... One rumor is to avoid legacy apps checking for Windows 95 or 98 could have mistaken this version number. It's a new age for Microsoft products and I think a very good one.