Terrence,
   I'll have my grt efis running (on the copilot side) in a month or so.
   I got mine as an engine monitor but the efis was almost as cheap as air-data so I got it.
   Seems like it might be good but obviously I'm not betting my life on it.
   Dealing with them has been pleasant but startup-like.    e.g. you need to
read through all the config options very carefully and very explicitly order what
you need (TIT support is a factory change for example).

Colyn