I just received the first six Lionel LionScale Chesapeake & Ohio Hoppers today. The paint job is good. The metal wheels roll very smoothly. Only wish the Uncoupler plunger was back further from the knuckle coupler and not so visible.
I tried an Atlas O 50-ton Bettendorf Barber truck with air hoses, but it raised the car up 1/8" higher above my H21a Hoppers. I may add Kadee Couplers on the middle cars to give a more pleasing look to the passing string of cars.
The cars are very nice, roll smoothly with very little drag. These Hopper cars are a great way to fill-out a coal train.