We just returned from the 3/26/05 Western Itinerary. Not sure if this will help you out or not. We did the "Fury Catamaran Sail, Snorkel & Beach Party (4-4.5 hours)" thru Disney.
For us, this excursion was ok. I was expecting it to be like the Golden Eagle Catamaran in St Maarten on the Eastern Itinerary and was a little disappointed in that respect.
I highly recommend the Golden Eagle on the Eastern, but would only recommend the Fury Catamaran on the Western, if you are there primarily to snorkel. I'll go into more detail in my trip report, but we were not impressed with the beach they took us to (anybody know which one it was?). The beach was very crowded. The water was not at all that pretty aqua color we saw at the beach in St Maarten on the Eastern. There were no chairs, only rubber mats. We had very little time on the beach.
The crew on this Fury excursion is fantastic and helpful and fun, just like the Golden Eagle, but we loved every thing about the Golden Eagle excursion so much more. Unless I was into snorkeling more than "beaching" I would not do this Fury Catamaran excursion a second time. Edited to add that the crew on the Fury is exceptional. They do everything they can do make sure you have a fun, safe, memorable, time. That's what I will remember the most.
We would love to try one of the beaches on our own next time, but the crazy taxi stories I am hearing will probably prevent us from doing so -- I like safe drivers

. I wish those beaches that everyone raves about had their own (safe) transportation from the pier to their beach.
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