Only problem with sorc/sage heals is except for one, you have to be stationary, which is frustrating, at times (TFB, last stage of Kephess, our sorc healer can only cast 1 specific heal the entire 10%, while the merc healer carries the majority of heals). HOWEVER, to me, that balances out with getting extricate (especially handy if you PVP, in Huttball), and self heal, no cost, on a 30 second cd, as well as our knockback being no power. My sorc is level 45 currently - when I was duoing, I was specced dps, but when I started to solo, I switched over to a heal spec). I'm having a blast with it, and while keeping Khem up to date on gear, we've handled much that I wouldn't have been able to handle in a dps spec.