Ok, I don't like most gas stoves, but here goes my 2 cents:

If you are, say, trying to boil water, and you have the butter tub or another container holding water around the gas canister, wouldn't it be smart to add some of the heated/heating water from the pot to the tub to warm up the gas canister while you are trying to get the water to actually boil?

Meanwhile, I'll stick with my 123.