This is the most fuel-efficient stove we tested. It includes a versatile pot with top and bottom covers that can also be used as cookware. The burner assembly, however, is difficult to control, somewhat unstable, and not even slightly windproof. For these reasons we do not recommend this stove.
Several better alternatives include the MSR Reactor, Optimus Crux, and MSR Whisperlite. The Reactor ($160) is an integrated canister stove that can only boil water. The Pocket Rocket ($40) is a small and durable canister stove. The Whisperlite ($80) is a lightweight and durable liquid fuel stove. Of these three options we believe the Pocket Rocket is most comparable to the GCS. It is slightly less stable, but smaller, lighter, more windproof, and more versatile. Combine the Pocket Rocket with the MSR Exo 2 pot (2.4L, 9.3oz, $90) and youll have an improved GCS that weighs 38 percent less. The Pocket Rocket- Exo 2 setup will cost you $130, $10 more than the GCS.
The Jetboil Group Cooking System (GCS) is a more versatile and larger version of the popular Jetboil Flash. It has a 1.5-liter pot that is capable of both boiling liquids and serving as a fry pan. Unfortunately, the GCS doesn't work in the wind, is hard to control, and is the heaviest integrated camping stove we tested.