I have not found the small nozzle Kirbys,such as the Dual 50
to be cumbersome at all.The Kirbys started their clunky oxiness
with the Kirby Classic all the way up to the Heritage II,which
sometime in its production had the head trimmed down to a smaller,bell shaped trim.Then,in 1990,with the intro of the G3,
the 1st self-propelled Kirby,they were clunkier than ever,now weighing in at 24 lbs.,but were easy to push,however.