I have the large Gorilla knock-off of the Little Giant. I think it's a 22 or 23 foot. It's very handy. Can break down into two step ladders to make a scaffold (although I've not used that feature yet). The unequal length leg arrangement for working off stairs is very handy.
I paid $200 for it at Home Depot. They make a smaller one, 13' or so, that sells for $100.
My only beef with the ladder is that it's really heavy. Probably weighs 80lbs. But, it doesn't wobble much!
I echo the sentiment about it being great as a tall step ladder; two He-Men can climb it and won't phase it at all.
When I did the research to buy one, I think I recall reading that Little Giant's patent had expired and so Gorilla and the one that Lowes sells (Werner maybe?) were waiting in the wings to offer a near clone of it. My uncle has the real one, and I see virtually no difference between his and mine.
Anyway, good luck with the real one
And don't dent your roof!