It's amazing to me how many similarities there are between the Navigator and the Silver Shadow and Whisper. The stateroom and deck floorplans are nearly identical. Silversea, upon request, will stock your room with your desired sprits, but with an open bar policy 24/7, I have never found a need! The entertainment is pretty similar, although Silversea has offered some fabulous specialty acts...there was a Cirque du Soleil (sp?) show that was breathtaking.
Since Radisson and Silversea are so similar,I find itinerary to be one of the main decision factors in choosing....although with Silversea offering their Silver Sailings itineraries with up to 50% savings as well as great deals on select first quarter 2006 sailings, they are successfully attracting both new and returning guests to their ships. I love a deal!