Incredibly good. A short way into our burgers (Longhorn burger for me with brisket, cole slaw and pickles; a mushroom and gruyere burger for David) we said, wow, these are possibly better than any place except Umami burger. As the meal went on, we decided Holsteins was giving even the venerable Umami hatch green chili burger a run for its money. It was that good. I got the Longhorn burger because I love BBQ, even though I thought the idea of brisket on a burger was silly. It wasn't. The brisket was sliced thin, and was a bit crisp - almost like a super delicious bacon. And best of all, the BBQ sauce was not cloyingly sweet. A minor criticism, I thought the cole slaw disappeared and the pickles were too dominant - maybe the quantities need adjusting. David was similarly pleased with his burger, every ingredient was distinct and very tasty especially the mushrooms. One of us got fries and the other onion rings, both were good. Service was first rate. We didn't try the shakes. We were very impressed.