He's referring to the outer round tube of the SuperRails, not the main rail. Price certainly isn't an indicator of quality in the market, just a matter of how much profit a company wants to make. I can remember a company touting their 1/4" thick wall rails costing a good chunk more and then seeing a pic of them bent, and that was the main rail. We've had a few people put dents in the outer tube and we're in the process of beefing up some in the next run. It's not an easy balancing act of trying to make the best product at the lowest possible price. Especially when last summer steel prices skyrocketed and we just ate the difference.
BTW-anyone who has bought a set and would like to replace that outer tube can get it pre-bent, cut and the notched supports out of the heavier material for cost of steel-zero labor.