Very nice cones!
These smell great and because they are so tall they last for a good while too. I can't comment too much on the backflow as I usually have a fan going that stirs up the smoke before I can see it really cascading down my burner. However, I do see it there so I know they still work in that manner.  The seller included a sample of dargon's blood as well and it smelled amazing as well! Will definitely purchase again in the future.
Rating: 5 stars