I'm using 7.0 still. I think I will wait for the next version before upgrading. From what I've seen CS2 isn't a major improvement off of 7.0 and I don't want to spend the money twice if I don't have to.
I find it a major improvement. Tools and things are easier to use. But one set back is a couple things are gone under filters . I'll get over it. PS 7 doesn't have many brushes left available for it though.