Is he worth his points cost?
More on this at 11.
But seriously, I plan on running him in a fairly melee oriented list, incubi, succubus, wyches as troops (that is not the topic of this thread I'm using them.) Maybe even get my wracks in close who knows.
Point is, is his father of pain rule really worth the points? I'm leaning towards yes as I can guarantee that FnP early just by keeping stuff nearby. Also the furious charge turn 3 is great for the incubi he will accompany but also usefull for any charges I make with wyches within his bubble.
Not to mention he can soak up some wounds in a challenge with his invuln/FnP