I love my Cuisinart Electric Pressure Cooker. It makes great bean soup with dry beans in less than 30 minutes; makes a great pot roast with the works in no time. I have had one issue with it twice that I have no answer to so I give it a 4+. 

Twice now I make one dish and upon completion, clean the pot up and go to make another dish. Pressure doesn't build and it goes right to warm. There is plenty of liquid and the pot is closed properly.  I even let it cool down for 20 - 30 minutes and it keeps shutting down.