The only Turbomeca engines I have personal experience with are the Arriel series. Non-FADEC models can be somewhat exciting to start, but once they are running, they do well. We have seen excellent reliability, and very good fuel efficiency. The only problem with the PT6 is that it sucks down huge amounts of kerosene. It's also too big, but that's not a fatal flaw. Burning >30% more fuel than the Arriel is.