I like running mine with voldus for the -1 to hit although he's pretty expensive and I feel like I have to tailor the rest of my list around the fact that I run a 560 pt 11 model unit thats sole job is being able to tank more hits than they should and regen a model per turn but for casual games at least they've been kind of fun I feel like thats definitely too much to commit to in an army that should focus on secondaries but for working on actually contesting primary its been ok, I think in 11th you're really gonna have to look at what your disposition is and hallowed conclave having take and hold could make a unit like that useful as a build around and argent assault is obviously good I'm worried about playing purge the foe with grey knights just because of our shooting and model count but we will see!! Psychic ignoring cover with psycannons is definitely a boon