Had a salesman come to my house and give a pitch just for grins. At the time I owned a G5. Told him that if he could demonstrate how the Sentria (other than looking sexay) was superior to my machine, he had a sale.
He was training someone who he had with him, and he soon figured out that I knew far more about Kirbys than he did. He went through the snake oil demo, and then I used his attachments on my machine to show that it did the same thing. He was pretty embarassed, but in the end the one thing that *I* pointed out that *he* didn't notice was that the Sentria did have a faster motor, by about 20% I'd say.
Still didn't buy it