We purchased ours from Lowes some years back and it puts out a decent amount of heat as the flame is adjustable and can get quite large when set on high. On that setting it will go through a significant amount of propane, but we don't use it to keep warm and usually have flame set lower, mostly to add ambiance to the campsite while enjoying the evening outdoors.
It gets used primarily during periods of the year where fire bans are in place, we do not bring it along otherwise. Although it is convenient, cleaner, and in many cases less costly to run than using firewood, we will always prefer the real thing. We live and do most of our RVing in the four corner states and dry firewood is abundant and easily accessible wherever we go.