I picked up my green City of Denver from the Train Shack in Burbank the other day.
The casting on the power car is as smooth as glass. The finish is flawless.
It looks like the vestibules are a hair shorter in height than the originals, as there is a little more clearance between the inside of the car roofs and the tops of the vestibules (most of the originals I have seen are scratched in this area).
I have only had tome to run it around the small loop of track on the floor, once or twice. So far it runs nicely.
The sound package seems to be similar to the one on the Burlington Zephyr (good, loud, diesel sounds).
More to follow...