Better than a hot box for what ever reason. I hot boxed a couple of the bows I made. Then belly heat treated repeatedly till the belly turned brown. The back of the bows were hot to the touch each time I heat treated them.. I got a few bows that ended up with some reflex, but not like the fire hardening process. All Hickory bows. I am trying White Oak right now,and having a hard time getting it dry enough with the hot box ,and belly heat treat to try, and tiller. That wood is also green.The limbs are moving left ,and right , and twisting. The next 2 white Oaks that I make will be wider, longer, and fire hardened. I really do think I will get better results.