Quote - I already had a 'canary in the coal mine' boot partition (Mac Lion; mostly I still run Snow Leopard) and so deployed DS 4.5 there. With limited testing, it seems to be stable; haven't crashed it yet. And it does 'feel' faster, but I may not be pushing it hard enough to tell. I'm cautiously optimistic, and hope to find some time to play with it more.

Are there any new features that seem "really cool" and worth getting?