I bought two for my grand daughter. Children love to push locomotives. They are hers, and she knows that it is OK to push them. G-Pa's nice brass locomotives get left alone.
On my own, I did convert a WbB E8 B to powered. This gives me the option of running ABA; this combination pulls like a bear. Or I can run one powered A on one consist, and AB on the second (with the powered B pushing the Dummy A).