Their rep at Imaging USA said this would allow it to be used "with any softbox." I tried connecting it to just the ring for a Magmod MagBox. Forget it - if I move it even slightly, the quick release pin comes undone, so I doubt it would hold even a lightweight softbox. What a disappointment! I find it illogical that a product would be made to put out 9,000 lumens but unable to accommodate widely used softboxes.
I saw someone below said, "while it's not necessarily meant to take large modifiers . . . " - WHY NOT?
I also read: "Light and Motion suggested I set up the softbox only on a light stand using the Bowens mount adapter then set up my Clx10 or Stella Pro Reflex S on another stand and shoot through to the softbox." REALLY?! I think it is safe to say you have poor product design if you have to advise your customers to MacGuyver a solution!
Maybe the solution is to wait and let Godox make a knockoff of the Reflex, then buy that.