Our computer got the Win10 upgrade(?) this week. Since DH & I had sort of decided to go for it , but hadn't got around to it we weren't too upset. All the files and everything have been transferred across which is good, all the websites that have been saved onto favourites etc have also been transferred across - however any websites that you might have only saved on 'Pin to Start' have been lost.
I really wish that it was possible to rearrange the order of the websites I have saved though, instead of it staying strictly in chronological order as they were saved, but I had that same gripe with Win8 too.
I haven't had any problems with watching the current show (except for getting interrupted by the family) though....