I have one but don't use it very often, it seems to chew through butane cartridges.
My Coleman dual fuel on the other hand is much more efficient and seems to use less fuel, mind you they cost a lot more.... (just make sure you don't use unleaded fuel, Shellite is best).
Weigh up the cost of cartridges vs. the cost of the Coleman & Shellite. It's not that long before the costs start to equal out.
Colin

