In reply to Evil John:
Had mine for about a year. It never seemed particularly powerful, but recently it started playing up. I'd open the valve and nothing would happen, then gas would pour through, and then it would totally stop - operating the valve would make no difference. Then it got to the stage where gas would trickle through and operating the valve would make no difference. Sent it back to MSR and they replaced it. Maybe there's a design problem with the stove.