This is more a question for those who have experience with rooted phones. For me, the biggest feature of Sense UI is how smooth it is in terms of transitions between screens, scrolling within things such as the Apps menu, etc. (couldn't really care less about the social networking integration). Now, there are some homescreen apps out right now that are definitely (in my opinion) better in these regards than the standard Android UI, but they all still fall short of what Sense (or Rachael or even MotoBlur) has achieved. Is this same smoothness, though, something that can be achieved if/when (since it really is just a matter of time) people figure out how to root the Droid and make custom ROMs?