I was reading some guides earlier today and one I found (from Mod 13) said that Repurpose Soul was the main source of heals for a Righteous DO. I didn't have it at all in my feats so I respecced and added it. It doesn't seem to work very well at all. I've been going back over my log after fights and it seems like it a) doesn't proc on every crit and b) Doesn't do nearly 15% of the spell's damage as healing. I had a 102k crit on mob and only my companion was in range for the heal and I saw a green 140 pop up over his head. Checked the log and sure enough, it said Repurpose Soul heals for 140.
Right now, this feat seems like a waste of points to me but I figured I'd come here and ask to see if I'm missing something.