Great answer from EGOL! I'll add in my two cents as well, based on a little personal experience.
I'm a California girl, I've lived here all my life and have never lived in snow. I don't know how to deal with it, what questions to ask, etc. My parents have retired to Virginia, where they do get varying amounts of snow in the winter. At Christmas I often look for things that could be helpful for them to have around the house, what could make things easier for them, etc. I need the explanation as to why this will be helpful, what conditions it's helpful in (great for Minnesota snows, but not as needed when you only have a couple of inches), is it good for someone in the AARP age bracket, can I use it on a slate roof, etc.
I'd also have someone look over your pages and make sure there are no spelling and grammar errors. On one page, I spotted a sentence starting with "His" instead of "This". If you copy and paste your pages as plain text to Word, it can help with spotting some of these typos. This will help your user trust a bit more.
A final note about your roof rake. On the roof rake page itself, I don't see how to order extension handles, yet the video (which really helped me understand how it worked) talked about you can order them to extend the rake up to 40 feet.