My wife and I use these in our blinds. It doesn't get a full day on a bottle, but it's worth it on really cold days. The biggest advantage is that we can walk in a long ways - and dress appropriate for that - and then not need to pile on clothes, or get cold later on when we sit still. The click starter isn't terribly loud, but it sure ain't quiet. Ours was problem free for about 3yrs, then the flame sensor kinda fouled, so it wouldn't stay lit - tore the coverings off and ran steel wool around the sensor tip and it was fine again, but finding that out in the blind that day wasn't very fun.

So whether you're buying a bottle of gas or a bunch of hand, boot, and body warmers, there's a cost to not dressing warmly enough.