Pros
I worked for SimulTrans for almost five years in their Dublin office, While I was there it was a fantastic place to work. Great people, great work/life balance/great ethics.
Really great place to work. People stay for a long time.
I'd go back in a heartbeat if the position was available.
Cons
There were just two people who seemed to get on with one another but nobody else so I guess it was just them.