I just finished updating all of my field installations to at least 7.3.1. I'm wondering why I waited so long... huge difference in performance across the board and so far so good.
I do find it ironic that the only box I have in my list that is allowed 7.4 at this point also happens to be one that doesn't have a paying sub on it.
But we all know what my luck is like.
Also, my office's issue with random CPU hard locks appears to have vanished with the upgrade. And several minor issues with my installation, like the missing apply icon have been resolved. I was going to pave this box for good measure but it's run so well this weekend I think I'll just leave it and see what she does. She has been upgraded all along the way since 5.1.