If you're running Wiin7, you're now 3 full versions behind, 4 after Win10 Anniversary comes out. Microsoft will begin to lose interest in you, as they did with XP. In that sense, if it ain't broke don't fix it doesn't fly anymore. (Nothing personal there, by the way!)
I just did the upgrade from Win7 Pro to Win10 Pro. Went VERY smoothly, no issues at all. And just like Win7 is what Vista SHOULD have been, Win10 is what Wiin8 & 8.1 should have been. And it runs ezwinscore.
Plus, since this was up under VMWare Fusion, I made a backup of my Win7 guest machine ahead of time. Now I have both 7 and 10 running. Not that either one will see that much action from me. I just needed to do the 10 upgrade as I need to be able to answer Win10 questions from other folks in the office as they start to get new machines.