The FADEC modules are very robust and have a very low failure rate, to my knowledge that is,
So I wouldn't imagine that the control would cause maintenance issues, a laptop may be needed to download engine data at periodic inspections, not unlike the Bell 407 FADEC.
The engine I have interest in is the Graflight 350 currently being tested in a Cirrus, should be certified early 2016 with first 500 sold off production line.
This appears to be a ground up designed and built aviation specific CI engine, capable of running on distilate and Avtur.
I'm hoping it performs and sells
