I like these little engines! I've seen them in person. They are wonderful little work horses. I saw these used in a real standard gauge freight yard.
I normally don't like freight yards and railroad operations in model trains. You know what I'm talking about, the things the high-rail folks get excited about: moving around consists of cars, scheduling freights and passengers and so on.
But these little guys actually make that kind of stuff really fun. When I saw them running, they were very good pullers (for their size) and didn't make that much noise (mostly due to well done roadbed and excellent track laying. I also was suprised how well the trucks stayed on the track (unlike some other manufacturers!).