Snag:
It is essentially just like every other canister stove regarding flow control of fuel - quite good. JetBoil, however has a fantastic heat capture/exchanger ststem that really picks up the efficiency.
There is now a GCS (group cooking system)for JetBoil which is a larger pot and I have seen a fry pan too with the "flux ring".
MSR makes a heat exchanger for use on pans if you are not using a jet boil stove, and I highly recommend it for fuel conservation.
Funny observation: If JetBoil wasn't so good (Backpacker Magazine Product Award Winner), them why did MSR come out with one last year?
On a side note, I still use a stove with a "remote" fuel source as I enjoy using an Outback Oven. Can't do that with a bottom mounted canister - too much heat - BOOOOM!.