there is no smoke and mirrors
Any demonstration of any machine be it Kirby, Filterqueen, Electrolux, Fairfax, Tristar, Rainbow. The machine being demonstrated is the machine that is going to be shown in the best light.
Kirby is a superior machine through Quality,Reliability and Performance. If you are happy with a Bissell Power force, then that is the machine for your. However, I will challenge you to come back after that Bissell has cleaned a 3,000 sq ft home, daily for 40 years and tell me about your experiences with it. There are many Kirby owners that can do that and usually with no or minimal repairs.
My Kirby Omega was purchased new on May 30, 1975, though it went into semi-retirement in December, 2003 the machine is still running with only changes in the belt, brush roll and one fan (my fault). It even still has the original light bulb that is working.
Someday if I want to have the machine refreshed, rebuilt and brought back to new condition under my original purchaser agreement to rebuild I can do so for $49.50 plus shipping cost. Now I would call that a Quality machine that is repairable, Reliable as it is always ready for action, and it is versatile and Performs the job it was designed for flawlessly.
Now there are some requirements for keeping that machine in peak condition, actually this applies to all appliances, but we are speaking about the Kirby now. You must take care of it, maintain it like a quality piece of equipment. Empty the bag, on this machine it is recommended after every use. Change the belt when you notice the brushroll is not turning like it should. Clean the brushroll and adjust it on a regular basis. Don't use the machine for other than it's intended use i.e. cleaning out the fireplace or the aquarium.
You wouldn't purchase a Rolls Royce and then go mudding in the woods anymore than you would drive your red neck Pick up to a formal ball. Why would you leave your Kirby on the front porch in the rain?
Caligula:
When you had a pre-qualified appointment they were the best, but there were times you worked crew in a neighborhood. You may do 10 demo's a day for whomever would let you in the house. Those were usually the ones that loved the machine but couldn't afford to buy a Dirt Devil.
Surprisingly, and I have heard this from other dealers as well over the years. You are more likely to make a sale to Irma and Bobby Joe at the trailer park than you are to Buffy and Roger at Willow Brook Estates. Irma and Bobby Joe may see it as a status symbol, or a good long term purchase. Roger and Buffy don't care.