It's not a bad talent, but it's not as good as tree. Even in perfect, 100% perfect scenarios, it barely outdoes tree in possible effective throughput but has to much streamlining of spells to make it pass it.
- Both in 10 and 25 you'll be WGing on CD and SMing on CD. So trying to say 'it's better for 25s' doesn't work....at all. In 10s it will still almost always hit max people unless you place it badly.(Wg a random person in the corner).
- The SM + WG CDs are clunky. They don't fit together. So actually using it to it's full potential you won't be using both on CD as you should and it puts you into a hole of either changing the way you heal to fit soul or wasting the talent often.
- Even in a perfect situation which would literally never happen, it barely does more than tree while cutting out any and all flexibility you had in a raid.
For it to be better than tree it needs to not have the ridiculous restrictions it has. To maximize it's potential you'd need to be glyphing to HT and using it, which would most likely end up in a throughput loss.