I think i'll use Lightspeed now for resurrect people (-2,5 seconds and -25% mp reduction will save my MP so hard). 10 seconds for heavy healing will be useless because the GCD. You will cast 3 spells (or 4 if you are fast) with the same amount of healing potency.... (oh but you can move! (very situational)).
The change is ok but not impresive.