I have used the same Coleman stove for camping for 15 years. Bought a new one and can NOT get the flame to adjust from full to simmer - the knob turns but reverts back to full if you don't hold it. I would return it in a heartbeat but the 30 days passed while we were out of the country camping. VERY disappointed! Now I see many people with the same problem - stove is virtually unusable for me to cook on.