Well, I bought one, and returned it today. I was going to put it by the front door, to keep Lefty from jumping against the window and scaring the mailman. The behaviorist said it probably wasn't a good idea for a dog already as anxious as Lefty. Rather than give him the run of the house, we may end up gating him upstairs.

My husband and I did entertain ourselves for a few moments by trying it out on ourselves.