I ordered a GF chocolate cupcake and my husband had chocolate cake. He tasted my cupcake and said the taste was the same with a slight difference in texture but if he had not tasted them together he would have never known. I really enjoyed the cupcake and did not have a reaction. I feel they do a great job in minimizing cross contamination.
Celestial Sweets Boutique is one of my go-to desert places. It helps that they are able to tell you exactly what is gluten free. They often have a gf cake, in addition to their macarons and gf menu of plated deserts. If you went when it was under its previous and ownership, it's worth another chance now.