Posted for "Matt Hapgood" <hapgoodm94@alum.darden.edu>:

 To Walter and Jabe,
 
 I don't know diddly about the Aerosance FADEC unit.  What I do know is that
 I have over 300 hours on my own FADEC system, and though it is not perfect I
 am quite happy with it.  I can choose LOP or ROP, depending on which of the
 two redundant ECU's I utilize to control the EFI.  For timing it uses a
 timing curve very similar to the ElectroAir electronic ignition units.  At
 anything over 85% power I run ROP.  My temperatures never exceed 375 on hot
 climbs.  It's an easy to use, no-mixture system.
 
 Drawbacks:
 1.  Electrically it is very complex.  Troubleshooting would be nightmare.
 That is offset by the fact the sensors are available from any GM part store.
 2.  I get slightly uncomfortable in crappy IMC - I worry greatly about
 static problems.  So far the computers have not glitched even once, though
 my AOA and Sandel have.
 3.  My CHT's are TOO cool in cruise - around 275.
 
 So, would I recommend a FADEC?  Yes, with reservations.  The simplicity of
 no mixture, easy starts, and cool engine and better power (via advanced
 timing at altitude) is a wonderful thing.  Concerns would be parts and
 complexity, not limited "operational flexibility".
 
 Matt