I think it is a wonderful show. Selfridge was indeed a very different character---a true PT Barnum type that really stood out in London--or anywhere else, for that matter.
Oddly enough, I think this is actually one of the most subdued performances Piven has given; I always think he's a bit over the top. However, he's a perfect match for the character, as the real Mr. Selfridge was nothing but over the top, at least for his time, anyway.
I find all the little aspects of the store really interesting--perhaps because I worked retail for so many years.