I choose them purely because of recommendations. The simulator is fully EFIS and is based on the 737-800 which also attracted me as I had always thought my best bet of a job was with a certain Irish loco. Course lasts if I can remember right 3 days for ground school and 7 days ( 4 hours per day ) for the simulators. The instructors as like CRM are very experienced with most being aer lingus , aer Arann captains.
Also had a friend back from CRM recently and had a great experience with them and as previously mentioned you will rarely see a bad word written about CRM.
If I would do it again I would still choose Simtech , although it was more expensive, the 28 hours flying the 737 most definitely helped me with my interview.