I only have 2 Windows machines these days, both are running Win10 and have been for a while. It was a welcome upgrade from 8 and 8.1 for me and I've come to like it pretty much as much as I do W7. If I were running 7, I'd probably stick with it until 10 has been out for a few months - although in my experience 10 has been very stable throughout the beta and preview stages, and I've had no issues with peripherals. (which is more than I could say about my experience of 8)