I finally received the locos this week, and they are very impressive. The 'stainless steel' looks a little too gold in colour to my eyes, and the stirrups are a bit clunky (see photo below), but otherwise these are VERY nice locos.
Here's how the pair look sitting on the siding at Wynnewood:
This crop from the previous photo shows the stirrups. They seem to have too much paint on them.
Here's a link to a short video of the locos in action.