I really like the three WHC units that I have.
Just to add to what Joseph Frank posted. The poles (trolley) are not wired out of the box for overhead running, but can be made to do so.
Its not just a flip of a switch to engage the overhead power.
The poles are no longer available so if you do get a unit, be very careful not to break or lose them. They are finely detailed and easy to break, I know, I broke one.
Enjoy them, hopefully one of the current manufactures will pick-up the tooling and run a new batch with updated electronics.
Charlie