The majority of my gear is pretty well split between Edge/Hog and AUP (Oceanic, Hollis, Aeris). The shop I work for carries both brands. I service both brands (amongst many other) and simply put, all 5 first stages and 7 second stages that I own are Edge/Hog dive gear. Hog is as good if not better than Hollis in every way with the exception on port spacing on the Hog D2. I couldn't get my Oceanic transmitter to fit with all 4 LP ports ocupied. Simply fixed with a 1/4" extention. Not an issue with the D1 though.