But the critical factors will be check-in time and the time taken to get through US immigration security.
If EOS can streamline check-in and security procedures for its exclusive clients, then it would really be on to something. However, if it still means queing up with the rest of the herd at Stansted before an expensive flight, then queuing again at New York, it won't offer much of an advantage, in my opinion.
Still, the very best of luck to them!