I haven't played it, but I started reading through it a while back. I stopped, because there's a chance I might play it and i didn't want to spoil myself, but the two things I've heard about it several times are 1) it can be very lethal if run as written, so be prepared; and 2) it wouldn't suit PCs who are uncomfortable with allying with bad guys at times. Bit like the old Savage Tide AP in that regards. Traditional rigidly LG paladins beware...