Miller Show carts

Does anyone here have any experience with Miller & Son show carts? These were Amish-made carts with curved shafts and were very fancy, especially with lamps. I’m not sure of the exact name, but I know they were Amish. The carriage maker is long out of business.
There is one for sale, but I’m trying to find out more about them - how do they ride, do they hold up well, nice balance, easy to get in and out of – that kind of thing.

If you could post a photo or link to the one for sale folk would be able to tell what type suspension the cart has and how that impacts the driver/horse comfort. If you had measurements we could estimate what size equine would fit it best.