I think so. The free upgrade offer is supposed to be for one year after the Windows 10 release. Even some of the things people are concerned about are improved by having the Windows in a VM. My current desktop isn't powerful enough to run a Windows VM but I've thought about it for the future. Looks like I'd have to buy a retail Windows licence to do that - though sounds like Windows 10 is offering free upgrades forever, and if that's the case, a retail licence is a better deal than before. Cygwin was the one I used longest ago, strangely I can't quite remember why I didn't like it, and it might well be better now than it was. I should install it again and find out... I think the things that didn't work were mostly about trying to build open-source software, kind of like what happens on the Pandora now. A sequence of errors where each takes me an hour or more to figure out what trival-in-retrospect change is going to fix it, and no idea how many more there are going to be.