I am going to keep this review relatively short, because there is not much more to say about the Celebrity Solstice fleet than I have read/wrote before, so I'll just post a few thoughts on my latest experience.
Aquaclass - the last two cruises my wife and I have taken on Eclipse and Reflection have been Aquaclass. To us, it is well worth the extra money. Free bottled water, the iced tea, Persian garden access and Blu (Blu alone is worth it) make this a "must have" on our trips.
Blu - I can't say enough how great Blu is for both breakfast and dinner. The service, food choices (who thought a yogurt parfait could be so good?) and lower key atmosphere make Blu extraordinary. By the way, if you do want a dish from the MDR menu, they will bring it to Blu as well, but we always found something we like better on the Blu menu.
1540 was just close enough to the elevator to be convenient, but not so close that there was too much noise.