Amalfi shuttle from Rome FCO

Sorry, we don't have experience with that company. 100 euros sounds reasonable, since regular train fares from FCO to Salerno would be about 65 euros per person with 1 - 2 connections.

My first thought was that too cheap but again no experience. What is the nature of the unfavorable reviews? Sometimes people can be unhappy over very small problems that would not be important to me. Is there a reason for the shuttle over the train. My preference is almost always the train - more comfortable.