This.
I only ever have healer comps out, and it's almost too easy. The only time I have an issue is if I'm not paying attention and I pull a group that's too large for me to hold aggro on (with multiple silvers/golds). Healer comp, in his nifty full 192 gear from Yavin, is hard to pull aggro off if you're a dps with no taunt, so he ends up healing himself, which makes the fight a LOT harder.