Performance is the big one. Win 10 - when it's good - feels like a super-polished Win 8. They fixed the "metro" app stuff to not be awful. It does a good job of

Performance is the big one. Win 10 - when it's good - feels like a super-polished Win 8. They fixed the "metro" app stuff to not be awful. It does a good job of getting out my way and letting me run what I want to run. It's when it intentionally gets into my way that I get cranky.