I actually have that EXACT forge! I've been using it at my historical reenactments. It actually works remarkably well, though you'll spend most of your time maintaining your fire rather than actually working the metal. But if you stay on top of it, it gets nice and hot without wasting too much fuel.
I picked up a new forge with a little bigger fire pot I'm gonna experiment to see if it will replace that one in my portable shop, but that remains to be seen...