I ordered the little Aerostich a few years ago after reading a thread on this forum about it. Aerostich accidentally shipped me two of them, two identical boxes, two identical packing slips. Obviously, I could have just kept them both and no one the wiser. But, that is not how I operate so...
I called Aerostich and explained my situation. The very surprised lady on their end asked if I wanted to ship the second one back. I had already decided I wanted both because the quality is obvious once you hold it in your hand. She agreed to charge my card for the second one and we both laughed about it. And you know, they did not charge me full price. I got a really good deal on that "second" compressor.
My GoldWing riding cousin has that other Aerostich and is the envy of his Harley riding buddies. He has had to use it numerous times but only once for his own bike.