Been using windows 10 since the first public release
And this new build feels like a really big step backwards from previous builds.
* The start menu has gone back to metro, you can't resize it, it isn't anywhere near as customisable as before and just feels like they've gone back to windows 8 and thought "hey, lets use that".
* They've sneaked bing into a few more places and it feels more awkward, the fact you can't change it to google makes it all the more a frustrating experience.
* Onedrive is really being pushed down your throat. "Don't like it, tough.. you can't disable it anymore without hacking it up"
* They are pushing the metro stuff a lot more in this release, a lot of apps that you could uninstall before you cannot now.
Overall, if you're using a previous build of windows 10 I would say avoid this one as it is a big disappointment. It feels like Microsoft have ignored all that positive feedback that has been given to them and taken massive steps backward. It's a damn shame.