I HAD the walk behind sweeper, not the pull behind(tractor) and found that when lawn sweeping on windy days that, as the leaves rotated around the brush and thrown into the 3 sided hopper the wind blew them everywhere even the ones INSIDE the hopper.even on gusty days.no i don't own one no more. but on the other hand my walk behind sweeper(when adjusted low) was an excellent way to make stripes on the lawn.