I spent yesterday installing the Win 10 anniversary update and checking out the changes. I have dsl with a fairly slow download rate and it took about 7 hours downloading and installing.
I also installed Ubuntu and took a look at the new Bash shell and read a few of the documents.
I really haven't had everything long enough to give an opinion yet but first impression is that it hasn't really fundamentally changed anything for me in the way I use my computer. A small change in appearance but nothing that's really befuddling.
I'll post any pros or cons as I get to know it more.