Perhaps you're right that the heat exchanger feature is heavy and unnecessary. However, I'm willing to give it a try for my needs and tolerances. I WANT to cook while on tour to avoid the abominable offerings out there in America and the heat exchanger will allow me to cook more efficiently. Also, I come from a background of carrying heavy loads on my back. Although the Esbit is a bit heavier, it's nothing compared to other things I've been required to carry long distances. If the Esbit makes it over Loveland Pass with me, then it'll make it anywhere. If I blow up on a mountain pass and go stark mad tossing bits of kit hither and yon halfway up, I'll come back and tell you I should've listened to you .
Pretty funny! Actually let us know either way.
One thing that my comments didn't take into account was that the heat exchanger also acts as a heat diffuser and might help eliminate hot spots. Personally for me weight is pretty key and efficiency is almost not a factor at all on tour because I buy 12 ounces of fuel at a time in any town big enough to have a store. Personally I try very hard to avoid having to buy a liter at a time. Fortunately the yellow bottle Heet is pretty widely available everywhere I have toured so far. My next tour is the Pacific coast though so it may be different for this trip since it doesn't get below freezing much there.
On trips where I need to carry larger amounts of fuel that would not be the case, but in those cases I'd take a butane, white gas, or gasoline stove. For me these are generally not bike tours for someone else they might be.
Lots of room for differing users, conditions, and opinions here. My point was just that heat exchangers were invented for backpacking or mountaineering where folks are likely to boil a lot more water and carry a lot more fuel. It definitely isn't a slam dunk that they make sense for everyone for bike touring.