The Rainbow vacuum has been in my family since 1975. It began with my mom purchasing one when they were sold door to door. I also bought one in 1988 but my mobile home burn down and also the vacuum. I have purchased refurbished Rainbow D4 SE and even though it says it is refurbished everything looks brand new and works great. I have always believed that when I am vacuuming by home all the dirt from floors, carpets, curtains, ceiling fans, pillows, cushions etc. should never spread back into my home. I am sold that the Rainbow vacuum water basin process that traps the dirt is the vacuum cleaner for me.