"I am leery of products force you to use only their accessories: pots, etc."

ah, but that ain't so Prouboy - with the pot support on top of the jetboil burner, you can use any pot or pan you want, including the the one in your picture. no different than a pocket rocket or any other upright cannister stove

Look, the whole point of a jetboil is to make as fuel efficient a system as possible - that is the object of having thier own pots with the heat exchanger ring - using a different pot, you lose some of that fuel efficiency

and while you can "cook" with one, they aren't really designed to do more than boil water as fast and fuel efficiently as possible - no point in buying a jetboil if what you want is a stove to cook on

by the way, hang on to that Peak 1 - coleman seems to have stopped making it - they have a similar model, shorter with a fat butt, but no more Peak 1 - better start hitting garge sales to see if I can find another.