We are just off a northern loop sailing of the Galapagos on Celebrity Xploration, which is the 8-cabin catamaran. Much of the info out there for Celebrity Galapagos sailings is specific to Xpedition or Flora (especially Flora!) and some aspects of Xploration are very different. If you have questions about or are considering Xploration, ask away and I will do my best to answer while it's all still fresh in my mind.
Note about flights: Celebrity operates a charter flight from Quito to Baltra and back, but you can only be on that flight if you also book your international flights through Celebrity, or book a longer package with Celebrity adding the pre/post cruise options. We booked all international flights as well as pre-cruise hotel & Quito excursions on our own, so hadh to book Avianca flights Quito-Baltra and back on our own as well. If you have questions about flight/hotel bookings or related topics (getting transit cards etc) I can answer those as well.
In a nutshell, we absolutely loved our week on Xploration, especially the intimate family feeling of such a small guest count and crew and wouldn't hesitate to book it again!