I've installed it and been running a bit, not any serious work, so far not much new aside from the I/O. But so far it hasn't crashed. Wish it had more features, the new I/O functions are I think a great step forward. But I have heard a friend who has his system crashing a lot with 8.1 now, until he figures out why, might be prudent to be careful if you're in the middle of a project.