The Celebrity Equinox is a beautiful ship meticulously cleaned and maintained. The Eastern Mediterranean ports-of-call would make up a perfect itinerary except that each stay is too short by at least half. Even at that, first time visitors to these ports-of-call (like ourselves) have to visit so many unskippable sites in so few days that it really is an exhausting trip.
Aquaspa class offers nice accommodations (the showers are fantastic), better dining, and closer proximity to the pool and spa decks. The other advertised in-room amenities were just marketing hype: the "floral arrangements" were a single bud in a tiny vase, the afternoon canapes were marginal when they weren't irrelevant because of being ashore, the aroma stuff was nonexistent as was the "pillow menu" (though I have no doubt you can get as many pillows as you want with a quick phone call or word with the cabin stewarts).
We loved the ports-of-call and the ship was spectacular. However, leaving Santorini before 10PM is immoral (especially when the ship simply holds station most of the night in front of the next port-of-call at Mykonos). Giving Celebrity the benefit of the doubt, I suspect that huge cruise ships in port beyond closing time for the souvenir shops would screw up the evening ambiance on the Greek islands. If we consider a repeat of the Eastern Med cruise, we'll give careful consideration to the smaller cruise lines with ships that can stay in port later or, alternately, the bare bones cruises that have you forfeit comfy cabins, good food and on-board entertainment for rock bottom prices and much longer port stays. It just might be better to spend the money saved on restaurants and entertainment in the ports and just use the ships for clothing storage and a place to sleep.