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I switch over a free upgrade for Windows and its marvelous.
Ofcourse the first of it is the Menu and Start Button
because it is FREE :-) .FREE..FREE...FREE
in my point of view the main issue is Start menu in metro style doesn't familiar with a lot of people.
i'll answer the second part , windows 10 is more familier like windows 7 but with windows 8.1 enhancments :)