Personally I don't like the insulation inside of it, too easy to push stock into the walls and damage it. I don't use it a whole lot any more like I did several years ago, every now and then I'll forge a san mai or cable Damascus blade.. I don't remember the name of mine, I've had it so long I forgot and it' so dirty if the maker is on I can't see it. Mine is exactly like ones you see on Forged in Fire. I like it because of the fire brick it's lined with and doesn't take long to bring it to forging temp. Outside looks like it's a hundred years old and inside is in great condition, fire bricks are a good a the day I bought it. I don't remember either how much I paid for it.
Whatever you get, protect your floor from flux, it will eat up. When I forge I put in a piece of 1/4" 304 stainless to cover the floor.