While the burger tastes amazing... EVERYTHING has gluten in it. Even the spices. There is huge risk for cross contamination with this place, and when I went the first (and likely the last) time, I was glutened pretty hard, even bunless.
But... with that said... for other people who don't have to worry about that issue, it's AWESOME. The burger is HUGE.
I was visiting with friends who were eating there, and found that they have a half size, if your stomach isn't big enough to handle the full thing. :)