They just taste more complex than a regular chocolate chip cookie, between the browned butter and the sourdough discard. Not at all sour, very sweet. The adjustments really work and I like how he describes the changes. I've had to adapt cakes to vegan and it reminds me of those adaptations in a way, but none of the adjustments harm the flavor, they enhance it!
Highly recommend making them. Long runway but I do make a double batch and keep the little dough balls in the freezer, then everyone else (well usually my husband) bakes them on demand, never more than 25 minutes away from a cookie.