You want a backpack blower? Get a big one that will blow a yard full of leaves into one big pile in about an hour. Or three inches of snow off a driveway in twenty minutes. Or melt several inches of ice off your porch and steps in an hour. You want to blow sawdust or your mower off use a blow or vac shopvac, or a corded electric, or a battery powered electric blower. The last thing in the word I want climbing a ladder or pulling up by rope onto a roof or yanking and pulling on while I am on the roof is a gas engined anything. I clean off several roofs and quite a few feet of gutter several times a year. I use a cheap electric for roofs and odds and ends. No gas to mix, no ethanol to clean from carbs, no jerking to get it started, no care at all. Just use it and hang it on a nail or throw in behind the seat of the truck.