[...]
[on PFRPG prestige classes] Not intended to denigrate what is in the Pathfinder core rules now, just sharing my thoughts.[...]
My players are not very fond of prestige classes included in PFRPG. The classes either fail to excite (Theurge, Eldritch Knight), appear to be subpar (Duelist, Chronicler) or do not contain fixes to old problems (Shadowdancer's limited teleport/summon shadow).
I have used Assassin to scare beejesus the party, but that's the limit of my interest, though.
Disclaimer: To me, classes are building blocks, to be mixed and dipped instead of binding agreements, just like they are presented in d20 Modern. YMMV.
Regards,
Ruemere