I don't mind it too much.
1.5 is a general under-the-hood release anyway. Lots of bugfixes (almost 4000 of them) and other things like that. Not much in the way of new UI, but they're finally going to do something with bookmarks in 2.0. They're batting the idea of meta-bookmarks around, which is good.
well, at least this fixed the problem I was having of not being able to copy and paste urls when I had the bookmark manager open.
I've been waiting for re-arranging tabs for a while now. It's nice to have the option.