I had a little fire and it kept me nice and toasty, reflecting alot of the heat and acting as a chimney to funnel smoke away from me, however I did find it created some wicked fire tornadoes, this was mostly my own fault as the ground was uneven.
It's surprising sturdy as I expected it to be blown over by the wind, I'd recommend burrying it slightly with a rubber mallet on soft ground.
Overall highly recommend for anyone who camps or just wants to get extra heat from a fire!