i primarily use straight suction for hard floors, vehicle carpeting, small rugs and dusting. i tried vacuuming my carpet with my first connie soon after i got it, and though good, just cant compare to a brushroll or beatbar upright or power head. cannisters are great machines for small rugs too.
ive found, from non colletors, back in the era i enjoy vacs from (mid 50's - early 1980's) most people had both and upright and a cannister. it was not uncommon for a home owner to have a hoover convertible, and connie in the same home for example, since both do well at jobs the other cant. so far the only vacuum ive used that could clean straight suction on a wall to wall carpet even close to a pn or brushrolled upright is a lux with the flip tool or a kirby. but these machines are dual purpose, and not straight suction only.... my connies, swingette and slimline after are found with less heavy duties than the convertibles, kirby's and pn luxes i own. still used frequently and do thier job well, just not entire home cleaning..
Will Hemb