Agreed, or a secondhand Kirby, back when they were simple and light (before they succumbed to the disease of gadgetry and power driven this, that and the other thing.)
If you have allergies etc. then a HEPA filter might be worthwhile, otherwise probably not. I have to admit that once upon a time (in college, and unable to find a co-op job for the summer) I took a summer job selling vacuum cleaners and my experience was much like that of the guy that admitted to selling Rainbows. It was a good product but way overpriced and the marketing was very slim shady. The model I'm thinking of was a squat canister with a conical HEPA filter and it worked by throwing the dirt out to the side of the canister through centrifugal force rather than blowing the air directly through the filter. I can't remember now what it was actually called, or if they're still around, but I wouldn't recommend buying one simply because of the cost.
nate