I've had Impossible from Red Robin and Burger King, which both grill their burgers, and have found them to be pretty darn indistinguishable, and I'm a big time burger fan.

The Beyond I find to be very distinct. I haven't been around "raw" Impossible patties, but I've made the Beyonds at home a number of times. They smell like cat food to me before they're cooked up, but I absolutely love the flavor of them so much! They have this vegetal background taste, but whatever it is, it tickles my taste buds in a very pleasant way for someone not usually the biggest veggie fan. I could see people not liking it, but I get periodic cravings for it now, since it is such a distinct flavor that nothing else matches.