Bought one of these puppies. I was very skeptical from the beginning, but no more! It is (a) a very nice piece of equipment, (b) has done some strange things that I would never try with a regular ladder, and (c) it is extremely stable.
This is probably the first ladder I've been on that I haven't had confidence issues with. Even fully extended, it is very stable. And one of the best things about it while using it as a stepladder is this: because it has rungs on each side, you only have to move it 1/2 as much when working around a room (like cutting in when painting).
The only negative I have with it is weight. It's obviously much heavier than a step ladder, and when just using it as a step like to change a light bulb, it's a little cumbersome. But, it's lighter than a standard extension ladder, so if you are using it like that, you're ahead of the game.
Final review-Extremely pleased :up Don't know why I would ever want / need / have another ladder.