In our school system we have a bunch of them (not sure of the model). We use the big ones to change lights in the auditoriums. They are good and bad. The good: 1)goes to about 22' an is solid all the way up. 2)Will allow you to make the two sides different lengths to accomodate sloped floors. The bad: 1)as we put it "it take 3 men and a boy to handle it". (unless you have a wide open space, then 2 can do it). 2) difficult to transport due to being about 12' long (closed) and the base is about 4' wide.
All in all we like them ... just don't plan on a 1 man crew using it, not even on a big project.
