Hi Mike,
I never tried the Avalanche but did try a snow rake. It broke the first time I used it. The snow was too wet and heavy. After many years of getting up on my roof and shoveling off the snow, slipping and sliding and having to reshingle the roof 2 times I decided to put on a metal roof. I stripped everything off, blew in additional insulation, installed new plywood, paper and then installed the metal. I picked a dark brown color which absorbs solar heat during the day (don't know if you noticed it when you were here) and for the past 2 winters I have not had to go up and shovel. It just slides off by itself now. How's that blower working for you? You must have had some seat time by now.