I had seen one similar to that one in a muffler shop back east.
I thought it was a good idea then but, it really is only good for things you have great access to.
So if you wanted to use it in a tight spot, like between the firewall and your headers your kinda screwed.
My buddy has one at his auto body shop. It worked great for getting the rear axle out of my 450 when one of the bearings seized up on the axle. It gets really really hot. We had the axle glowing within a minute or two.