Aye Higan (Good to see you back bud!), it is a HAK pack that has been used on numerous other NWN servers. I've checked it out myself, and all I can say is that it is awesome! It adds a whole new element to the game, making it feel much larger than its actual scope.
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Ok, I did alot of work checking out the prc so i could get an idea how to balance, WOW. I REALLY like this thing, lots of new spells that are already balenced! the new eye candy is awsome too . Also i want to point something out, metamagic dosent effect PRC spells unfortunatly.
I used the PRC with some singleplayer mods. I was keen on the henchman stuff at the time. Whilst promising it seemed to me to that it increased or rather introduced some choppiness on some mods. Not quite our recent "slide show" but enough to be annoying. I uninstalled it but needed to do a complete reinstall (it corrupted my HotU chars - should have read the instructions!)
If it runs smoothly I say yes.
For those of you who haven't used the new classes in P&P, remember most of the new PrCs cost spell casting levels which really bites. Fun though, if less powerful.