[Mcgoo]

There is an unusual apprehension towards SP's but the hard fact is, they are basically at our mercy. I have taken SP's above me, and you can check me in armory, I have nothing special. Its knowing weaknesses. Shadow priests in shadowform ONLY do shadow damage.. use a pot, use spellstone to remove dots, and use fire (immolate/confl/incen/soulfire). All those mean bad days for SP's. If you are super pumped on shadow damage, dish it out.

With imp, its important to not use him for anything but mana, as anything more will put him out to be attacked, and even a gimped SP will knock that HUGE stamina buff off you with that in NO time. I don't know if you thought of this, but Demon armor has an innate health regen and shadow resistance. So make sure to use that.. If affliction always lead with corruption/UA.. If its a shadow priest I usually do CoShadows to open them up more to my damage.. if the priest is almost gone and you see him start to heal don't be afraid to swap curses and go with tongues.. a slow casting heal can mean you win!

All in all, they #1 aren't immune to fear.. You can get around those things easily enough with patience and gameplay. DC is what I use to stop heals usually, and someone said use your trinket.. Thats really key, with a spellstone a +crit/+damage trinket can mean you walk away and he has to wait for the spirit to bring him back.
#2 Pray on his weaknesses. Biggest problem with SP is mana.. if his damage isn't hurting you at the rate yours is him, drain mana. If he's doing more to you than the other way around, drain life to keep you in the game. I'm no expert by any means, but I also have never lost to a SP (well once at 61 when he was 69, but seriously)