I upgraded to windows 10 from windows 8.1. I have no issues with windows 10. Of course, that's because I dual boot that machine and I'm normally running Ubuntu, which runs crisp and clean. I rarely boot into windows. It lays dormant like some ancient beast...Who knows within a year it just might have Ubuntu on it........Yeah it was, I did go ahead and upgrade the Lenovo Yoga 2, I rarely use it (mostly when traveling) and really did hate 8.1 especially the Charms feature which I was constantly accidentally opening up. Besides even with the upgrade the 10 second boot up only went to 15 seconds.Well that was fast!!
Wait a year later. As you know, Windows PC's get ever so slightly upon slower each boot up...that 15 second boot up would have easily been 45 seconds within a year.
similar here...I only use Windows for one program (Beersmith) and I hate it every time. And not just saying that, I cannot stand waiting forever till it fully boots