It is an excellent stove in that it is lightweight and compact. Has always been reliable as well.
The obvious problem with the butane models is at altitude or very cold conditions the butane doesn't work as well as gasoline/with the pressure pump
Can't speak for the "very cold" but I have used mine for the last 5-6(?) years at around 11,500 feet without a problem.
if you go for more then just a few days in the backcountry make sure you bring a couple fuel canisters
Better to be safe than sorry, but there is also the consideration of weight when backpacking. I have used the stove for up to 8 days for 1 meal at night for 3 people and coffee in A.M. and have never even come close to using an entire canister.