I just spent two days training with AST and I must say it was the best two day SIM course I have ever taken comparing to both SIMCOM and Flight Safety. I fly a Piper Navajo with similar characteristics of the twin Cessna and the characteristics of the Precision AATD simulator was amazing. One scenario that was a game changer was the the take off of a high elevation airport with a high density altitude. Losing an engine after takeoff at gross weight really gets your attention. Chuck was able to assist in making the correct decisions. We practiced this scenario several times.
I could not believe when they threw a bird strike at me. Extremely realistic.
If you are interested in safety then I highly recommend AST. They will show you some short cuts what will make you a much better pilot.