Congratulations to the tools team, I'm loving the network panel and the object inspector. And the built-in tools are so much more responsive than Firebug that I'm tempted to switch right now. There are just two things that I'm immediately missing:
1) When I log objects, Firebug prints a preview such as ["a", "b", "c"] or {foo: 1, bar: 2} to the console, whereas the built-in tools print [object Array] or [object Object] and force me to rely on the object inspector (which I'd really just like to use for very large objects, rather than every single little object).
2) I like to try out snippets of code that are longer than a single line, but I'm not a huge fan of the scratchpad (can't be docked, no autocomplete). Firebug allows the console input to toggle between single-line and multi-line, and I'd love if the built-in tools had this as well.
I'm sure I'll stumble across more differences, but the tools really are looking great. Congratulations again on coming so far in so short a time.