Greetings,
I'm currently running Win10 4 computers, personally. Zero issues whatsoever; couldn't have been smoother. At work, we've been widely deploying it for a while now. My corporate laptops have had Win10 for a while, latest is a touchscreen unit. Again, zero problems. If you like Win7, you'll like Win 10. It's like taking the best of 7 and 8.1, and putting them in one package. Best version of Windows they've done yet. Fundamentally, you'll want to eventually get there. MS is going the route of Apple...you need the initial license, but thereafter upgrades are free.