Grey is quite correct, aginst toughness 3 troops the punisher is by far superior allowing 3+ wounding, but aginst anything above toughness 4 you want the agoniser, its great to feed two squads to a wraithlord/avatar/hive tyrant/ chaos lord and be almost certain that no tonly will they hold it but they will win the inevitable war of attrition. Go sybarites! (it also makes your squad come to 176 points in a 15 man squad, I like squads that cost 176 points, 10 man raider squad, 15 man foot squad, 6 man wyche squad all 176, its the best points value ({), OK I'm getting a little delirious. I'll be quiet.)