I've gone pure healing so far, with Kaliyo tanking. Currently I'm at lvl 39 on Hoth (appropriate level).
Works great. I actually like the healing idea, enjoyed my resto druid in WoW. Fights do go quickly. DPS is usually not an issue, on single player mob packs (1 strong +2-3 normal, or 4 normals) I can choose to DPS (with melee and close range stuff) or heal, whatever I feel like to get them down.
On larger mobs. Elite or Champion, I have to heal, and can sometimes throw in a little DPS depending on the mobs DPS. I usually avoid these fights just because they take too long, and don't usually drop good enough stuff for me to care. I did one quest a while back that required me to CC one Elite while Kaliyo and I took down the other, worked out fine.