Came here to post about this, and glad to see a thread on it! One of our kids gave us one for Christmas. I'd been hearing about this thing for a while, and seemed kind of hokie, but pleasantly surprised with the utility of it.
Kids convinced us to try this rib recipe, which we did. It was really fantastic! And although the liquid smoke helped add some realism to the experience, I knew these didn't come off an actual smoker. But honestly, a more consistent cook on the meat then I could ever get out of my smoker. We too discovered hard boiled eggs, magical.
But mostly have been cooking beans/legumes in it. We never soak our beans anymore, which means no having to plan the night before if we think we want beans the next day. Which means we used to only eat beans about once every two weeks. Cannellini beans seem to take the longest at about 1 hour, 15 minutes. But man, they are so buttery smooth. We had some that had to be at least a year old, meaning super dehydrated. With conventional cooking, overnight pre-soak, the beans would almost seem dry/mealy. How could that be? They simmered in water for crying out loud! And if you simmered too long, they tended to fall apart. Not in the IP, they all stay intact and look like a picture-perfect sample of a bean. And silky smooth!
We got a 6 qt. pot, not sure of model beyond that, not sure if different "trim levels".