Tenacity once again, whats the numbers?

[Nedkel]

I can read here and there the numbers, obviously tenacity will never give us as much dps boost as DET, Crit or DHit do, but at the same time it does boost our mitigation for the same percent.
But i wonder, how about that healing buff part? Why i cant see anywhere the numbers, does tenacity healing buff works at all, does it has the same percent of buff as like it does for mitigation and dmg boost?

I heard also there is effeciency floor from which it start to give us anything, and tenacity brings the value straight away from 1 point, where determination starts to affect damage after 300 or 400 points in.

How does that exactly work? Im most curious about that healing buff part.