This is a great way to see the Galapagos. As I said to the Silversea rep from whom I bought the cruise, "Where else can you act like you are in your 20's during the day's activities and go back to being 70+ when back at the ship?".
Caution, however: You do have to be willing to be physically taxed. Getting on to and off the ship is not for disabled, crippled or otherwise challenged individuals, because the very nature of having to get into and out of Zodiacs, which are small bobbly vessels. Staff make doing this as safe and easy as possible, but they are what they are.
We were well taken care of, mostly personally, and always well from the time we got out of baggage claim in Guayaquil until the moment we passed through security on our way home. Silversea reps were all uniformly friendly, helpful and efficient.
Our cabin was spacious, clean and well kept.
The ship is not newly refitted, so there may be very small niggles but nothing I can think to mention.