Zip Brush
When I had my G4 i had a Zip Brush with the unit and it was ok. All but one of the couches in my house are leather and the stairs are hard wood, so i only used it to clean out the cats carpeted perch. Anyway, it would work ok but the brushes would constantly pop out. When I sold the G4 I included it in the sale of the unit, and when i bought my Diamond Editon i skipped out on getting the Zip Brush. I have a Rug Rat that i use with my VacuFlo system and i think its great! I think its the same as the turbo brush that kirby used in the 80's. I believe its much cheaper than the zip brush(about $50) and it does a great job (it has a geared belt). I've never tried it with my Diamond Edition but Im sure that it would work just as well with a Kirby as it does with my central vacuum
~Steve