Windows 10 gets a no from me. I will admit that the user interface is much cleaner and simple to use, I wouldn't ever touch it for the security holes it presents as of now. Yes, I can confirm that you can be prone for spying the government agencies. Not only that, Microsoft reworded some of their statements in their terms (I believe). Basically what Microsoft is trying to say is that you are strongly encouraged to make an Outlook account, and from there, Microsoft really wants (underline wants) to know what you are doing in the OS. The same applies for Windows 8.X.
Other than the privacy issues it shows, there is something in it that disables pirated software, since many use a lot of pirated software for tasks that the people use.
Long story short, nay from me. I'll stay at Windows 7, thank you very much.
I am quite impressed with what I see, only wrong thing is that I see small cutoff on the overworld that is the bottom of the hills. Otherwise, I see nothing wrong with it. Everything looks really clean.
I don't like Windows 10, in my opinion. It has a lot of security holes and it's pretty unstable when I tried it out. Felt like it was rushed.
As in options on how to revert back to it: torrents containing the OS usually does the trick and you will need to download the drivers yourself, but I can help with that. Reason why I say that is because you said that you can't revert back to Windows 7.
Android is preferred for me. I would switch to Windows Phone, but there is so little variety on what you can actually do with it. (Little customization, apps not available that is available on iOS or Android, etc)