So I'm considering making a WF melee guy and am considering taking healer's friend.

How exactly does it work? I know cure spells are reduced by 50%

Healer's friend 1 - +15%
2 - +20
3+ 25

I'm assuming these don't stack, would I be correct?

And since I'm assuming they don't stack, I'm assumnig 10 AP is a LOT to spend for an extra 10% of healing.

What do you WF tanks do? Take HF 2 and 3 or not? (For 2 AP 1 is worth it IMHO)

Thanks!