What do you guys think about devastators with grav-cannons? I always run my 5-man dev squads with matching weapons, so for me that would be 40 points less than grav cents and 5 more grav shots, but would lose relentless and the hurricane bolters. I don't have the experience to be able to weigh that out in my head.

If they're working for you, how are you running them? Putting them in a transport to get them into range sooner or letting them control the home side of the board?