After a looong hesitation because there was no "in sim menu" to chat with ATC, I finally decided to let a chance to your software and a get a copy of PF3: I don't regret at all !
I liked the overall immersion in the demo, but compared to the main competitor, the full product is just amazing. The sound quality, for most of the voices, is absolutely stunning. After trying many ATC softwares, I've never felt that close to the reality, you can really be proud of your work on voices and sounds in general, I am sincerely amazed.
I regret there is no navigraph support, hopefully it will come one day and enhance the software further and would make its use even easier and more realistic especially for SID/STAR (Would it be that complicated to add it?). I would really like to see that one day but that said, I don't feel it's absolutely necessary (doesn't mean don't consider it, just mean take the time you need to do it if you ever think about it).
Also, it would be great, as it's already been suggested, to be able to "modify" or at least make the software ignoring some of the waypoint in the FPL (in the case the fpl would contain some SID/STAR points like pfpx pln files do).
Other than that, I think this is a great ATC program which has a HUGE potential. As also being a developer (not a programmer though), I can imagine how hard it's been to reach such a result. Dave, if you keep enhancing it this way, if you keep listening to users as you seem to do until now, I am certain it will become the absolute must have for everyone searching for a realistic ATC.
By the way, I saw there was "only" 2 voices with french accents, if you ever one a 3rd one, I'd be happy to help

About my few troubles now:
- First, I am not able to get the Closed caption in a FSUIPC display window, all messages are shown in the green horizontal bar on top of the P3D window (but I hate them and usually hide them using FSUIPC). Did I miss a setting to make the ATC message appear in the FSUIPC display?
- I don't fully understand how to request another runway at departure, in the user manual it's said that we must ask for another runway once the ground give me the runway. However, it just skiped to the next TGS waypoint instead of asking a new runway. What did I do wrong/misunderstand?
Congrats again for this great job !
