I had experience on the MSC Divina and other of their ships in Europe. What drove me to the Seaside was the price and the reputation... I like the European flair in their food and entertainment.
One should never buy a new model of anything the first year it is released. I think the same is true of cruise ships. There was an issue with septic systems and some of the floors smelled, including our room. However, it eventually dissipated after day 4. ;(
One elevator did not work which made it tedious at times.
Very small and not enough storage space for clothes.