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#11
I may say that you upgrade to 10, give it a few days. If you like, you stay. If you dont like, restore the windows 7 image (which you should make before upgrading) back.
Once you upgraded to 10 within 29th July, you can install 10 again on the same motherboard anytime in future, for free.
If it is not upgraded within 29th July, any further update will involve the price of retail windows 10.
Now you know what you can do. Decide yourself. You are the one who is to decide it.