From what I recall it wasn't that bad in healing. Last logs I remember looking at, I had done about 900k healing with one tranq, so 110k hps. I seriously doubt you can match that with flash heal/binding. I mean its nothing compared to what you can do popping a Vamp on last stage elegon, 6m over 10 seconds
. But considering you can pre-cast before incoming damage, and the majority of the healing it does will be actually after you complete the cast (remember it does a 10k tick up front and a stacking HoT as well) If the player gets topped before this finishes, it'll get wasted.