Household vacuum cleaners question?

If I had carpets I’d do anything I could to find an older Rainbow. I inherited my moms when she didn’t want to fool with it anymore. It was already 16 years old at the time. Used it for 8 yrs or so, put it in storage for a while, moved & started using it again. Finally died after a couple years.
I bought my first house, the carpets looked pretty rough, but after 5or 6 vacs, they started looking better, bought me a few years before I could afford to recarpet the whole house. Let my neighbor borrow it for same reason. She was doubtful, but was amazed.
Can’t stand carpet anymore now though. Roomba with hard floors is where it’s at.