Rod, from 7 it is no big difference, just some cosmetic upgrade.
It is more a BIG improvement for those who (have to) use win8 now.
For the moment i can not find a real good reasonto make it from 7 to 10, the new internet explorer "Edge" is not all that impressive, but i use Firefox anyway.
To make use of the Win appstore, you have to sign-inn with a Windows account, who suddenly take's control of a lot of you're system, including the nessecesaty to put in a pasword everytime you start-up the system (but i found a way to go around this)
It takes rather some RAM memory to run well, specially start-up and shutdown ; i had to revert back to 7 on my laptop because of this.
You can install 10 on you're system no problem and check it out for 30 days, after that Win removes the back-up files who allows you to revert back ro 7.
So basickly you risk nothing trying it out, just DO NOT PERFORM A SYSTEM CLEEN-UP/OPTIMALISATION, i did this, resulting in the loss of those TEMP files, leaving me stuck with win 10, not that this is a problem as everything runs fine and i like the fresh stile of 10.
I have just one litle problem since i upgraded to 10 : now when i ad a photo or logo to the folder, they no longer sort automaticly in the folder, probably a setting somewhere, but i can't find it.