I haven't had any major issues on the machines I've installed Windows 10 on. That said the attempts to strong arm people into upgrading are getting pretty desperate, basically they were blowing on about having windows 10 on a billion devices and it'll be considered a failure if they now can't get a free OS onto a billion devices. Spoiler alert it's not going to happen.
Last time I checked they had hit the skids at 270 million, and they were massaging those figures something awful, they are even counting Xbox One's and mobile phones, neither of which are selling particularly well, and probably the 5 times I've installed Windows 10 on my machine. Currently it has about a 12-14% market share while Windows 7 holds strong at around 52%, even Windows XP has about 11% which puts into perspective just how badly Windows 10 is doing.