Tried Chomp yesterday after accidentally stumbling upon it, so damn good. Thought they'd fluked it.. so I went back this afternoon and took my girlfriend.. They nailed burger number two.
I'm also coeliac, got gluten free, and didn't get sick. The staff have the skills to prepare gluten free which is great.
I definitely recommend Chomp burger.. unless you don't like burgers or good service, then don't go there.