Back to the original question, I do not think the vert regt version is not out yet, I guess we will have to wait for the new reg to be released, if you look on the front cover of the new shocker manual you will see a picture that shows a new look reg, which I guess could be the non-vertical version of this new reg.
I guess this is why spe are only selling the the ultimate package with standard maxflow included, but once the new reg is out we will be able to buy the vert version and use a standard ASA air source (or CO2) if we prefer.