This Autothority controversy is still going on? I remember a big fuss about this a few years ago.
What I know:
I have the software (that's my car on the web site). I've met and talked to several people involved, Barry, a weekend SCCA racer who's 330 was the first car and that's a dyno picture of his car. John from Revhigh, who works with them, is a self modder like many on this board and posted the original dyno chart. Several people at AutoT, who are very helpful, even gave me a ride in one of their modded (600+ HP, see current issue of European Car) Porches when I dropped my car off for the software.

All good car people and I haven't had a reason to doubt their integrity up to this point.
Now, you do not feel drastic changes with the software, but this is true for almost all NA engines. You do feel it in the higher rpm bands, which is why I noticed it more at the track than on the street.
I have not had any problems in 2+ years of use now. Why do people have problems with Autothority? :dunno:
How is the dyno chart a fake?
See previous thread:
http://forum.e46fanatics.com/showthread.php?s=&threadid=53381