Ok! Will try to find it... If it comes out...As long as you can find it somewhere (I haven't), I would suggest yes. Because that's what I did when DP6 came out (I was running PB1 at that time).
It's out. Hopefully this one starts to address the terrible performance with transparency enabled.
@Fischer:
You always get Beta updates from the App Store when running Developer Previews, whether you're a developer or not.