This is my first winter using the Bio-Blocks, and I am very impressed. I use them when we travel in our Motor Home…they are clean and easy to carry in a plastic bag, they are accepted in any State with no concern for carrying unwanted infections. The small burner with 4-5 blocks works well for a campsite fire, as well as for cooking hamburgers and steaks. I also use them in my home fireplace. This winter we plan to supplement our fire at the “Smoke Pit”, a Maple Syrup cooking operation located near Millersburg. Overall…a great,, economical “green” way of using sawdust to produce heat… Very pleased.