I love my coffee can forge, i have built a few others, even a vertical using a homebuilt mini-sidearm venturi burner, made from 8" black stove pipe, lined with kaowool and coated that with satanite, the bottom is open and sits on firebrick so it will be easy to replace them if flux eats them up, works good. But i usually go back to my coffee can forge for most everything. Maybe if i start doing damascus or welding a lot i will use the verticle, but my little double coffee can one seems to do everything i need. I tried the one brick forge, but fond it too small for some of the things i wanted to do, i have even modified some hatched heads in my coffe can forge. My coffee can forge started out with a solid back, but for some of the longer knives (8-12" sharpened blade - not including the tang) i ended up cutting a triangle into the solid back, when not needing the thru hole i block it with a piece of kaowool coated in satanite that fits the hole to keep more heat inside the chamber. one thing that comes in handy on it is the small piece of pipe that the burner (the Bernzomatic with the flexible hose) fits into lets me slide it in and out to adjust the flame inside a little. I also got an adpter (about $13 from walmart or lowes) so i could use the 20lb bbq tanks, a lot cheaper than the little bottles.