When I got a Bethlehem Alpha for the wife I hooked it up for Natural gas and oxygen concentrators.
It cost nothing to run. It has real threads on the torch to have a hose screw right on, the base is nice, the valves are very fine, big and stays cool. Built tough no doubt.
worth the $209 I paid for it.
I have a video of mine running on natural gas.
https://www.youtube.com/watch?v=x7uBTg5Zd04