This is a superb experience. Read the extensive Cruise Review on sister ship Regatta elsewhere on this website. All of it applies equally to Insignia.
The cuisine, especially at Tapas on the Terrace, is excellent. The service everywhere is friendly and hard working. If you want a 600 passenger ship with no glitz--just good service and food--plus some entertainment this is the place. Did I mention the mattresses, pillows and terry robes in the cabins?
Downside: Overpriced tours and wine. Example: Secrets of the Vatican at $1,000 a couple.
Would we go on the Insignia again? We are checking its itinerary (and Regatta's) already.