So, installed 10 of them and I will say I am observing a snappier response and less chatter in the second. Sadly, these are all perspective. Historically, with a Zeagle reg, I could easily get the second stage down to 1.0 or .9 with the fires stage at 145/3000psi. Using the new atomic seats (curiously, the same as the hog seats) I was able to tune them down at or below .8 in all 10 cases. This is NOT what I would do for a customer, since that is below spec, but it does say something about the fit and finish of the components.
The seat is the real magic. As a matter of fact, in three of the regs, I replaced only the seat and was able to detune as described. The other components are likely more wearability. I am told by a Huish engineer that the blue plastic poppet is more rigid than the white. This may be necessary because the new spring seems to apply more tension as the old, because of it being longer by ~3/16". I want to measure the tension supplied by both springs and will let you know what I find. The new orifice is machine with a deeper cone that should wear well, and provides both slot and hex adjustment.
Overall, it works fine and I'll be curious as to the wearabilty.