BigBill: The biggest disadvantage to propane lamps and stoves is that they lose output in cold temperatures and high altitudes. I just returned from a hunting camp at 7400 feet +. The Coleman two mantel propane lamp did a fair job when hooked to small propane clyinder. When hooked to a five gallon bottle it did great. The problem was that I needed the top location on the post for something else.
I also used a Dual Fuel 2-mantel Coleman Lamp that out shined the propane lamp. I love these lamps.
An older "Winchester Brand" propane stove was very slow heating things up in the blow freezing temperatures. This stove has been dependable at lower altitudes, and warmer temperaturess. In the past I have used a very old large burner Coleman Cabin Stove at this location. It has been modified to use propane. It has done a good job at the high altitude with it's large burners. Sounds like a jet taking off.
The item that saved the day and took the large propane tank was the Coleman 15,000 btu heater. In the cold wind it was far more effective then any campfire. I have not been over to refill the tank, but it is still heavy. This item was used early in the morning and after dark. A darn good investment. I should note that no campfires were allowed. Even if campfires were allowed the heater was more effective.
I will be taking off for another hunt later next month. Camp will be at lower elevation but I am looking at "borrowing" a Coleman 3-burner gas stove from my son for the trip. I am looking at replacing the old Winchester stove. It will not be with a propane stove because of the cold weather and high altitude problems. I do not like waiting 30-minutes for water to boil.