It doesn't matter what class as long as you're very versatile at the class alt or not. We 2 heal all normals but some of the heroics call for 3 healing.
This ten man runs fridays and clears in 2 hours with 3/8 heroic last week with 2 pugs. We do it for fun, we do it cause it's an easy way to get free epic gems. 7-10 generally for this, maybe as we get more gear and a solid 10 man we'd do saturdays too and push more heroics though this is a very relaxed group.
Whisper decix in game.