I've eaten (parts of) 10 Shiras moose, all from Wyoming though. Flavor is always excellent, the tender ones are as good as it gets. The tough ones have chewy steaks, but are phenomenal burger. My 6.5 y.o. bull, killed 9/11/00, was tender enough to steak, though some round steaks were tough. The toughest was a cow of unknown age, she was too tough to enjoy chewing on. The tenderest was a 2.5-3.5 y.o., 36" bull killed in October - fork cut tender.