We flew into Fort Lauderdale and took Uber to Port Everglades Terminal 25. Embarkation was very smooth. Since we were new to Celebrity, we had to pass several check-in lines reserved for travelers of various elite levels, but there was nobody waiting in any of the lines. It took right at an hour from the time our flight touched down in Fort Lauderdale until we were aboard and having lunch in the buffet.
During this first lunch, we were essentially harassed by bar servers trying to sell us beverage packages. I would recommend being absolutely firm. If you have questions about the offerings, find a friendly bar (Passport - lobby - Bar is great) rather than engaging the roaming salesmen in the buffet. We were worried that this might portend bad service all week, but were glad to be wrong! The service on this ship ended up being quite good.
We chose this cruise primarily because it was one of the only sailings visiting St. Maarten during Winter break. Since one of us is a teacher, our cruise week is predetermined by the school calendar. The other one of us had a #1 sightseeing priority: Maho Beach in St. Maarten, at the end of the airport runway. We were enthusiastic to try Celebrity, having heard it was a nicer version of Royal Caribbean.
The "obstructed view" is caused by the rigging for the lifeboats. This only comes up about waist high (about as high as the railing on the balcony). The view out to sea is great. Balconies further back on the ship (aft) are further in from the water, so while they may not count as obstructed view, our view was actually better. The cabin was right by an elevator and a quick flight of stairs from the theater. The cabin had a lot of storage and the bathroom was quite large. If I were to sail on the Silhouette again, I would specifically request this cabin --- its classification as obstructed means it's a great deal, but the view is still fantastic.
We were an hour late due to the rough seas. The Captain let us stay an extra hour, but this port call was already scheduled for the afternoon, and just for five hours. An extra hour in San Juan at night isn't that useful, but we had dinner at El Jibarito and pina coladas at Barrachina. San Juan is a lot of fun, and I would recommend originating a cruise there (and tacking on a full day in Old San Juan either before or after the actual cruise).
We took the Fan Ta Sea 6-hour catamaran excursion. Because we were combined with another Celebrity ship that had to leave earlier than we did, this became a five hour excursion. We shared this with the shore excursion desk and they refunded us 20%, which was a fair resolution. The snorkeling was OK (about 40 minutes in the water). Most of the 5 hour trip was spent getting to the snorkeling area, getting on over to Nevis, and on the Nevis beach. It was fun, but we would have preferred an excursion with more time actually snorkeling.
Our priority was to see some cool landings at the airport from Maho Beach. We checked the flight schedule and it looked like the largest concentration of large planes would land around 1:30 PM. We forgot to account for the fact that St. Maarten was actually an hour ahead of ship's time, so when we arrived, it was already 2:30 PM local time (our fault!). This was still a lot of fun. We rented two beach chairs and an umbrella at the Sunset Bar for $20. Note that the Sunset Bar didn't have WiFi. The bar at the other end of the beach might have (we didn't check). We did see a couple of 737/A320 type planes land, and numerous smaller commuter prop-style planes. The taxi ride to and from the beach was in a shared van and took about 30 minutes in bumper-to-bumper traffic on St. Maarten's main road.