Best stove I have ever come across. It boils a liter of water in less than 3 minutes at 11,000 feet as stated! The adjustable flame setting was worth the upgrade to the Helios Guide. Only con to this stove is that it is not meant for long cooking times so gourmet chefs beware. I could not cook with it longer than 25-30 min before the fuel pre-heat loop would overheat and stop fuel flow so long simmer foods and trying to cook a zillion pancakes are not a real option. It did allow me to simmer long enough for the best beef enchilada dinner I ever had for me and my teenage army of three. The two pot system came in real handy too. I would recommend this stove and I am glad I bought it.