Just got a dirt meter from Ebay for older model Kirbys and tried it on my Classic. It handles very differently with the meter in place of the bag. Much lighter, less seal to the carpet. I guess that's because there's less air flow? Anyway, I vacuum regularly but the cat hair that it's pulling up is incredible. Of course, it's spring and they're shedding. I also adjusted the new brush roll to protrude 1/8" from the rug plate as is recommended on newer models. Very surprised at the amount of crap I pulled up tonight!