I have 3 or 4 different manufacturers models. The steel ones are quieter and to me a lot better... but they're also heavier. The aluminum ones can get noisy in cold weather. I filled all of mine with spray foam. I have 16 and 20 foot models. They all work about the same. Don't worry about your boot not fitting on them. They're very safe. I use a climbing BELT when putting them up. I dislike the metal buckles that some have. In fact, I took most of mine off and replaced the straps with rope. I sometimes use screw in too to get a couple extra feet above them. This time of year you can find some good buys on them.