I have read a lot of back and forth reviews, but I do recommend Duckfat. I am excited to bring my family here when we come back from Maine. It was definitely a small, crowded environment, so coming as a solo person I got seated immediately at the bar. If you're in a group you're looking at 45min to an hour wait.
I tried the tomato soup at the recommendation of a guest sitting next to me. It was very delicious. Reminded me of a gluten-free pizza which the bartender laughed at, but I felt like it was accurate. I also tried their version of the lobster roll. I understand how it's not a traditional lobster roll, but I very much enjoyed the sandwich. I also tried the cherry soda. I like that it gives you a soda vibe, but it's not sticky sweet, and then I finished it off with the salted caramel milkshake. I got more of a vanilla vibe with some caramel to it. It was very sweet. I think I may have enjoyed the mocha a little bit more, but I enjoyed it to-go and sipped it all the way to my car. Hope this helps - cheers!