We loved the itinerary, and the combination of "Sea Days" and Ports. (see my comments below about Israel)
There are about 2800 passengers on the ship, and you never fell part of a herd. Everything is done so efficiently that there were no long lines to embark, retrieve one's passport or find a seat at the pool. There is more than enough facilities for all.
We ate at Murano and Tuscan Grill, and I would say avoid both unless it is a special occasion. $40 per person to eat food that is similar to what is served in the MDR is ridiculous. Of course the presentation, service and ambiance is better-but not $80 a couple better. I also thought it was downright "tacky" for Murano to charge extra for Earl Grey Tea.
In fact, Silhouette charges too often for items that should be included-it seemed to be the universal opinion that we were being nickel and dimed to death. (Of course, you can avoid these charges if you wish and still have a wonderful time)