So I did a run with Humphreys natural briquettes last weekend. Intersting. you can actually see chunks of lump in the briquettes. Smoked like crazy on start up then only saw smoke from the wood chunks during the cook. The ash was very light and fluffy like lump. Unfortunately, it still almost went out after the guru shut down post temp spike. I need to do a better job stacking the briquettes so the fire is able to spread.