For years I have been snow racking and shoveling my roof. I would rake three feet up and would get an ice dam, then six feet another ice dam, I would go another three feet and finally would shovel my roof. Back braking work and very dangerous. I found out about Avalanche and figured I would try it. Well I wish I knew about this product years ago. It is so effortless and removes snow so quickly I was amazed! No strain from pulling snow. No damage to shingles. It weighs less than conventional snow rakes. I would recommend this to anyone that needs to remove snow from their roof.