As I reach the end of my last ton of Biobricks I thought I would post my impressions on them. I have been burning wood on and off for about 15 years but I do not have close to the expertise that others seem to have so perhaps my results will be of use to others who are considering using these things. Cost - Where I live a cord of seasoned wood runs around 250 I bought in October after getting my first oil bill so I paid more than buying green and seasoning myself. The bricks cost me 290 a ton in November again the height of the season so perhaps I could do better next year. Heat output- As advertised these things pack a punch, they seem to take longer than wood to get up to temp but when they do look out these baby's are like plutonium they glow bright red and if you walk away with your stove vent wide open it won't be long before it is glowing bright red as well. I normally got my stove up to temp and shut it all the way down. Burn time- This is where I really found the value. I am not sure what others consider burn time but here is how I judge. My stove is in the basement and heats two floors, because of this I need my stove temp not to go below 300. With a full load of 15 bricks I can keep it above 300 for 9 hours. Complete combustion- I found the ash to be very low as advertised which required my to clean the stove far less. Mess- I don't find these to have much advantage over wood. Although you don't need to worry about bugs you still get sawdust on the floor when you open the bag and I found they leave a fine dust on the stove I assume from opening the door to add more. The bottom line I will be buying them again next year assuming the price holds. As others have figured out they cost more to heat with over wood but the overall package is great for me.