The Conciergerie was very interesting, but in the write up on what to expect by Viator, it said to enjoy St. Chapelle after going through the Conciergerie, so I thought that our ticket was to both. The writeup needs to make it clear that St.Chapelle requires a separate entry payment.
We enjoyed visiting the Conciergerie. I think it would be more interesting if there were more of the building open to visit and there were more historical pamphlets for the facility. There was not a line for skipping the day we visited but it was convenient to have the three skip the line vouchers for Notre Dame, Saints Chapelle and the Conciergerie to vist on the same day from our trip plan. We also visited the place de la Concorde afterwards which was a nice walk to tie it all together. We loved our trip to Paris and really appreciated all the options Viator offered.