Hmm I would be interested to know what the bearing capacity difference is between a 3mm 100*50 Rhs and 70*50 2mm Rhs on edge? My guess is both are well in excess of what a human will ever squat. Maybe some of the engineers on the forum can give us n idea? I doubt it really makes a difference to the cages ability to catch the load. The pins will be the critical point during lift failure.
I'm gonna say that looks like a good buy if the layout is the same as the muscle motion rack. Especially if your in WA as that is where they are based. My guess is they would kill any other supplier trying to freight from the east coast.
At the end of the day this shit is all getting manufactured in china and the quality is all pretty much the same. Often it is coming from the same supplier over there and just getting rebranded. Although these guys have obviously changed the design slightly probably to make it cheaper to build and slightly cheaper to freight.