Before revision:  Although the mortar approach has  advantages in terms of its numerical properties, in that it preserves the local conservation properties of DG methods, in the context of complex 3D meshes it poses significant implementation difficulties which the point-to-point method handles more readily.
After revision:  Although the mortar approach has significant advantages in terms of its numerical properties, in that it preserves the local conservation properties of DG methods, in the context of complex 3D meshes it poses significant implementation difficulties which the point-to-point method handles more readily.