I am about an hour and a half away from taking my hogs under the ice for the first time! I checked ip's day before yesterday, verified all connections and adjustments. Full report later on how they and I did.
I take mine ice diving all the time (dive pretty much every Sunday during the winter under the ice). My hog regs perform flawlessly. That includes the primary and the secondary second stages. At this point, I haven't adjusted anything internal out of the box from Dive Right In Scuba.