[Stubb]

Probably real smooth due to the widespread beta and Yosemite being almost entirely visual tweaks and better integration with iOS devices. Those things shouldn't cause trouble.

Apple seems to have given up on core upgrades addressing performance, the ancient filesystem, and needs of power users after 10.6. And there’s still stuff that I could do on a NeXT in the early ‘90s that OS X can’t do.

[jmcdowell]

What sort of things do you miss? Never got to use NeXT so purely from a 'seeing what I'm missing' point of view.