The gigapower torch attachement is I believe less important for backpacking, so much as for when you need a torch for duck pinfeathers, welding pipe and household chores, and you're a backpacker who has isopro canisters around, it makes a lot more sense than the propane one that you have to buy the big canisters for.

it's also lighter for when you're soldering copper pipe above your head

If I did not already own a propane torch I use for this, I'd buy it.