Well, I'd like to congratulate you for making this very enjoyable quest. It is very well written, very well voiced and technicially it worked just fine. Most importantly, the way the quest is implemented and unwinded is very original, I especially enjoyed the fact that PC is alone in this, which allows him to have a private secret for his own. In the world where almost everyone seems to know everything about him, this was a very welcomed change for my PC. Contentually it was nice to meet someone who basically knows nothing about present events in Amn, and probably mostly because of this the encounters bring a bit different kind of atmosphere to the game. Accidentally, I got the final talk just after the release of avatar in Suldanesselar and thought it was very fitting. Also I like the fact that the quest spams across almost the whole game. My only minor nitpick would be how Aidan mentions he will return to the PC x-more times - I'm not sure if it's explained how he knows the exact number of subsequent encounters and it also spoils the suspence a little bit imho. But as I said it's not a serious problem at all.
To conclude my musings, Fading Promises is fresh, atmospherical, intimate and well rounded addition to the original game. I wouldn't mind if the quest was somehow prolonged into
ToB at all. Congrats and thank you for this!