I have owned the HHA soft leather back quiver, and ended up selling it. The soft HHA model contours to your back quickly, but at the same time the opening at the top gets smaller as the quiver contours. I had difficulty putting arrows in.
The stiffer HHA quiver is based (I think) on the original, and it may keep its shape better. It also would take a lot longer (years I am thinking) to break in.
I came across Art Vincent at the Baltimore Bowmen shoot, and picked up a back quiver from him. He specifically pointed out his quiver had a stiffer construction at the top so the opening would not collapse.
The design of the HHA quiver is in some ways better(IMHO) than Art's,
Why?
because the stitching goes down the outside.
The Cedar Ridge quiver (Art Vincent's), stitching goes down the back. In the summer time you will sweat right there, and the lacing does fall apart, It will need to be re laced. Not a big deal, but still a pain.
Art Vincent's quiver, (I have the "Rover")is a lot more expensive than the HHA quiver.
If I got a quiver again, I would try the stiff HHA.