I can't speak for trout, but I find the flavor of my pellet-fed HBG to be quite acceptable. I don't taste any difference between them, and my native BG. However, my HBG are free to forage as the mood strikes them, so even though Aquamax is a huge part of their diet it is not the only thing they have available to eat.
I do hope that the CC I stocked this spring have a milder flavor, (fed on Aquamax also), when compared to my wild, non-fed CC.