There's been many different variants to the design, specially to the tank rail/support. There's also been a few aluminium plates, and different finishes for the SS ones. I've had 2 different models, sold one and kept the version with a "U" shaped tank rail bolted to the SS plate. I sandwich the wing between the plate and rail. Setup with the tank is very fast as nothing moves, and the rails stabilize the tank more than if the wing was in between.
IMHO, it's the most comfortable backmount single tank BCD. For travel it's a bit heavy, as it is stainless, but still reasonable. With a 3mm wetsuit I dive it without any extra weights in salt water.
I only dive sidemount now, and my gf will dive my small custom made aluminium BP for traveling, so I don't use it anymore. Still, it's so nice I might have a hard time to sell it!