Wow ... two of everything - really? I didn’t think about that, nor the idea that I would have to change takes (mid-dive) for a new diver like doesn’t sound like I’m something I’d be ready for.
Plus I was wonderful if a "regular" BCD worked, or do you have to get a specifically designed BCD to accommodate this configuration. Just looking at the pictures, it seems awkward, yet you also state that it’s easier to "keep good horizontal position". Would love to try... but gee it looks odd.
... thanks so much for your response!