Vacuum Cleaners Discussions

I noticed an ad by a particle counter maker in  a trade magazine. I've seen one used in an online air quality pitch for Miele and wonder if the folks in vacuum sales here see them as being of any real benefit.  They could help buyers better decide on which make or model to settle on.  Meaning, on a scale from one to ten -- dust blower to super filtration -- could a particle counter be an aid in helping consumers find which models might be a good buy if  "top-of-the-line" won't fit the budget?  Does anyone feel particle counters are reliable enough to be helpful regarding making a vacuum sale?

Thanks,

Venson