I have upgraded one of our four computers and have not had a TECH problem. I have several operator problems and I feel it was easier to use than W8. The other three have W7 to W7 Pro and the biggest problem we have is with Yahoo thinking that I need their help ALL THE TIME and it makes idiotic suggestions constantly.
Sometimes there are things beyond our control and if I can get done what I need to do, well then OS is whatever the programmer wants it to be.
All my old stuff works including Office for Home and Student 2013 and Acrobate Pro 2011.