It seems most of the commenters in this thread are from an IT background (understandably). As a completely casual computer user, I love Windows 10. It has been just a small enough change that I know how to do everything without really having to learn anything new, but there are endless tiny improvements (much more pretty and functional Win+Tab / Task View feature, searching for your own applications is now superfast), and in fact everything seems to be running a little bit more slickly than on Windows 7, which is what I upgraded from. There really does seem to be a move to make a user interface which is totally suited to casual users like me who just want to get stuff done fast.

I haven't tried out the Phone Companion yet, but that clearly sounds like the direction desktop OS's should be going nowadays - integration across phone, home computer, TV and possibly work computer.

It really seems like Microsoft have worked out what the majority of everyday users actually want. If I have any criticisms, it's that there aren't any features where you think "wow, that's clever!"... like when I first tried out Google Now or Chromecast or remote access... there are no dramatically innovative features.