Tom, I haven't been on the Voyager, but did sail the Seven Seas Navigator last year, from New York to Bermuda, and had an excellent time. Very classy operation.
Also, I've sailed your Baltic itinerary on a different cruise line, and loved it. If the ship starts or ends in Copenhagen, take an extra day or two if you can, to visit Copenhagen's sites. We did a walking tour of Tallinn. In Stockholm, see the Vasa Museum. We were in St. Petersburg for one day and would have happily stayed much longer. We did a city tour in the morning and a Hermitage Museum tour in the afternoon. Incredible.