i got windows 10 today, it had a few kinks but after a few restarts everything seemed to work out alright. After I upgraded, my resolution was set to 1024x1028 (maybe, I'm not sure of the exact number) and it wouldn't let me change my resolution to my native res, at 1680x1050. I restarted twice to no avail, and after the second time Cortana stopped working as well. I restarted a third time and now everything seems good for now, but we'll have to see as time goes on.
Also it didn't give me the option to do a fresh install like it did on my surface :c