I have one and use it! Especially when camping....it saves on propane fuel.
I brown a pork loin roast in it. Drain off the fat, add 1 cup water, 1 slice onion and salt and pepper. Bring the temp to when it starts sputtering. I let it sputter for 55 minutes, then let it cool. That doesn't take long...do NOT put cold water on the pressure cooker -- it will just make it quick cooking and the roast won't be done. Then we slice up and enjoy. The next day, the roast is so tender we shred it and make BBQd pork sandwiches.