I bought one for a $100 and have used it for a while. I cut a hole in the lid and dropped the blades in on a wire and covered with a fire brick. It works fine but is very slow. About an hour to reach 1500. I wait till it is about 1450 then stick in blades, It had no pyrometer or controls, just switches. I added a controller and pyrometer. I am going to take it apart and salvage the bricks to make a real oven. You cannot reform the wires after they have been heated I have been told. You don't need a big oven unless making swords then it is still a question of length not volume. Mine was worth it just for the use I have gotten and the brick for the iven I am going to built.