I use the Edelmetal burner. The frame is super sturdy and keeps the kettle from slipping. In other words, the frame keeps the kettle centered above the 72,000 BTU propane burner. Important point to mention: I use my burner indoors, in my basement. I have a carbon dioxide detector within a few feet of my boil station and an inexpensive vent above my kettle. So, I have never experienced any issues. When adjusted properly, the flame is as clean as a burner on your natural gas stove. Plus, I can bring 11 gallons from about 120-130 degrees to a rolling boil in about 20-25 minutes.
When I bought mine it was about $150. I can see now it’s up to about $165. Still a good deal. The only drawback I found is that it cannot be converted to Natural Gas.