Just

Ozone is a pollutant, even those that are designed to eliminate odors in the home come with a caution.  If you have asthma or other breathing problems O3 is not for you.

Ozone as an unstable oxygen will turn to Peroxide when it comes in contact with moisture, including the moist tissue of your lungs.  Now I am sure someone will come up with a pro of breathing pure untreated car exhaust, but I wouldn't want that in my house either.

I have never used Baking powder in a vacuum or on the carpet, but have used Baking Soda.

Baking soda is not flamable, but it is corrosive.  So if it gets into the motor parts it can corrode bearings, brushes etc.

Having used none of the above I am not qualified to answer the question on which is better, but would like to comment on the genra as a whole.

If you think that you will eliminate odors going bagless, I am afraid you have been ill advised.  Bagless machines can get odors as well. 

Even though bagless machines don't have bags, they still have filters that need changed periodically; and on some  these filters can be quite expensive.    There are some machines that are the exception, but you do not mention them on your list.   Filter Queen, one of the better "bagless" machines has a filter that needs replaced.  Rainbows use water as their filter media, but they too can get stinky if not properly maintained. 

If you already have a bagged machine that is working, but just are tired of the bags getting odors before it's time to change it.  Would it not be less expensive to keep your machine with the bag and just change the bags more often?  Even a machine with more costly bags, a package of bags is going to be less expensive than a new vacuum. 

They story you tell is not just Kirby, but most of the D2D sales people.  I have heard stories about Filter Queen that were just terrible. 

As for getting paid for the demo, some newbees do get paid for the first week.  My Niece sold (ok demo'd ) Rainbows for a few weeks.  The first week she got $25 for each qualifying demo.  I think her sales manager managed to Dis-qualify all but about four of her attempts.  After that she was on her own.  It is very difficult in this economy to get someone to let go of $2,800 even if they have it. to let go of.  With gas at nearly $4 a gallon expenses added up quick; she is doing better working at Walgreens financially and stress wise.

  

Sorry Moose

I wrote a long response, but felt it wasn't worth it. 

Having T-shirts printed today.

"Take care of your own first."  "Keep jobs and factories in the U.S." 

I Will send you one as soon as I can find a textile and screen printer in this country.