Summoned greater deamon = waste of points.
I am sorry but i have proven it time and time again. If i know as a player its in your list i will pop your transport that has your champion in it. And dont tell me you are fielding 5-6 champions... its not point cost effective out of regular squads. I have seen it work as part of a bike squad, but in general, i am going to target those champs so hard that you wont be able to summon him in time and then you not only wasted points on the champion, you wasted it on the Greater daemon
Just my opinion and one i expressed to OST last night as well.
What do I mean? Well, I can provide some examples based on actual play.
1) I have three champions, one in a zerker squad with a Lord in a Land Raider and two in plague Marine Squads in rhinos. (three champs, not too unrealistic). I push up the board under fire support from my oblits, but get tarpitted in an assault just off the enemy's objective by a seer council with Eldrad. I am in trouble now, as they will lock me down or just kill me outright pretty quickly. On the objective, a unit of guardians is sitting down eating popcorn and laughing at my zerks. The beginning of the next turn comes and the Greater Daemon comes in. Now, I can use any champion to come in. In this case, I want to clear the guardians off their objective, so the eldar player is forced to try to remove the rest of my list from my objective.
Now, let's take a page from a real game: The champ already died and the Lord is holding onto life with one wound - opportunity wasted right? No, the greater daemon possesses the lord (we can do this to Sorcs as well), pops out an 1" away from combat as close to the lord as possible, due to his base size is within 6" of the guardians, he charges in the assault phase and lands 5 attacks at I5. His toughness and 4++ made sure he stuck around to see the Guardians off before Eldrad killed him, but the objective isn't held anymore and there will be hell to pay to win mine.
Now, what if this was multiple objectives? What if it was kill points? Multiple Objective gives you more opportunities. I can pop the GD out of any of my champs, which includes my objective campers - meaning the enemy will really have to focus on them in the early game (creating opportunity for my other units) or bring enough force to clear the plague Marines AND a greater daemon (while still dealing with the combat power of my Prince(s) and other assault elements - not likely. Kill Points? Use the GD to create opportunities to plow unsuspecting units ... I think we area all starting to get the point.
Point? What about points? The first example had me kill a 140 point lord to summon the Daemon. If you look at that through forum-tinted glasses, it look like the GD cost 240 points, but if you look at it through strategy, you won the game and that is all that matters and you won it due to opportunity created by the GD being in the list. Had I of been able to use the champ, I would have only made a 151 point investment, but those are the breaks and it doesn't always work out, but it creates an element of uncertainty that can be exploited.
Now, LSS, you have only fought my GD once, but I would love to test it on you again. I am sorry the other CSM players you fought didn't use the GD to proper effect, it just proves you are a better player, not that the Greater Daemon is a waste of points.
The GD isn't all great, if you don't have any elements that can get forward in a worst case scenario, like a line of Guard Tanks shooting you from their board edge in a KP mission, then it likely won't help you win, but in a three dimensional game with objectives, opponents that have to close with you or in multi-layered tourney missions, you will be better off with the GD than without it. My last word on the matter is for CSM players not to go overboard adding champs everywhere, but to just make it possible for a greater daemon to come in and build a list that would work without it as well as with it and you will be fine.
That's my two cents, I now open the floor to everyone else.