For the record... My STEAM app provided the 2.1 update immediately upon FD turning on their file servers. There was no delay or waiting for the update to propagate out to Steam like some had warned might happen.
The download speed has also been excellent! It is using every bit of my connection's bandwidth with no indication of any traffic based slowdowns or bottlenecks!

Only drag for me is that my Rural ISP only provides us with 14meg down, so even though I began my download at 12:30 p.m. PDT (A minute after FD turned on the tap) I still have 25 minutes to go with this 8.4GB DLC.
All things considered though, I have no complaints about how Steam handled the update. I won't likely be literally watching the clock and the live stream with future updates, but now I know that if I ever decide to do so, Steam will be ready to roll in seconds of the official release!
