Wet/dry vacuum

A few too many years on the old bones, and getting down to scrub a floor on my hands and knees is out of the question.
I'm interested in one of these duo vacuums: vacuum the crud up first, then wash the floor. Are they nirvana? Do they get the floor clean?
Also: (1) not interested in a hepa filter but (2) interested in nonbag - i.e. cups which you empty. I've paid over and over the cost of the vacuum in disposable bags!!
I've seen Hoover # H 3030 and a Dirt Devil advertised.
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