Our boy scout troop bought several of these after testing them against other name brand stoves. In our boil tests they were equal to the name brands. The integrated wind screen made them difficult to blow out, very nice feature. Great stove.
I am a scout leader and this is an excellent stove for new scouts. It is excellent quality for the money. It is not as efficient as the stoves with the insulated heating system, but it is much less expensive and bulky. The feature that really sold me on the stove was the built-in wind shield. Try as I might, I could not blow it out when lit. A distinct advantage in bad weather.
I've only used this on a 4 day backpack trip, but so far, this stove is very consistent and reliable. I don't have enough experience with it to comment on its efficiency, but it boils 16 oz. of water in about two minutes, if that's any indication. This is almost identical to the original pocket rocket.
Haven't had this on the trail yet but I have tested it at home and it get HOT and it gets hot fast. I've not used the isobutane stoves before and am a tad reluctant to limit my fuel for a trip but you can't beat the convenience of these stoves - thread it on the canister, turn the valve and light the flame.