You will see a huge difference in the Retreat experience between Edge class and Solstice class, specifically Eclipse, which has NOT undergone the Revolution process (and likely won't). That said, however, you will still receive The Retreat treatment with a butler, concierge, stateroom attendant, Luminae (maybe the best restaurant on the ship, and Michael's Club (aka The Retreat Lounge). The only thing missing is the Retreat Sundeck, which is a non-issue for us, and may not be accessible to all passengers where installed in M and S class ships.