A couple days ago after reading that an upgrade doesn't seem to override the MBR, meaning that I'm allowed to keep my dual boot system without having to reinstall grub into it, I decided to upgrade my win7 system. After many hours of downloading and installing, the first thing I noticed was how much more resource hungry win10 seems to be as opposed to win7 (or maybe it's just because of all the things I changed in win7 to eat up less resources). I'm going to do a little research, since I also want to disable a couple privacy settings, though.
So far I'm not neccessarily impressed. The graphical design looks ok, I guess, but outside of that I haven't really found anything that would let me lead to using it as my main OS over all the other options I have.