The MSR GK is a full out expedition stove that not only melts snow at a huge rate but also is like standing next to a F-15 during takeoff.I have the GK,Wisperlite and the pocket rocket.If you want top melt snow at upper elevations go with the GK,does not simmer well.If you want to melt some snow and have fair simmer qualitys for gourmet backpacking go with the wisperlight.If you want very light weight and simmering go with the Pocket Rocket or the JetBoil,both very good stoves.