The breakfast provided at the Mayflower, in lieu of a concierge lounge, is quite generous. It is served in a beautiful room, with choice of buffet or anything off the menu. In addition, in my experience the Mayflower is quite generous with upgrades to plats, including suites. All in all, to me, more than a fair trade for the lack of a C lounge. Also, the Marriott Suites I've stayed at do not have C lounges. The one in Atlanta also offers breakfast to plats in the restaurant with choice of buffet or menu.