I have had the Brunton Liberty for a year now, and like the ratings in the review posted on this site, it scores a little low. I think the idea of a mantleless lantern is a good idea, but the performance is something to be desired.
The air adjustment takes a little getting use to, but once you got the globe warmed up and glowing red, adjusting the intake makes it bright enough.
IMHO, there is a potential fire hazard with the open glowing globe, so I would use extreme caution if there is any wind and gear is in proximity. This item is definitely something to set aside and let cool off. When you turn it off, you will see the entire globe and protective bars glowing red for some time after.
It's a cool toy for those that "have to have all the gadgets" (like me), if you want some heat with your light that works too. However, for the money and the amount of light you get from it, my trusty Petzl headlamp works just as well for me.