I fixed a rather thick boneless chuck roast with fresh red potatoes, baby carrots, onion and celery.  I was just guessing about time but since the roast was so thick, I set it for 70 minutes.  Everything was perfect and it was so easy to clean up and no noise at all.  The old stove top pressure cooker had to constantly jiggle and make noise.  This one was so silent i didn't know if anything was happening!