leech

Has anyone tried using mana/life leech in pvp?
Does it actually work?

I'm wondering because the fact that you can only hit single targets already diminishes the usefulness of leech, but also if the pvp damage penalty (~91% reduced damage at high lvl) is applied before the leech amount is calculated, then you'd leech practically nothing.
Has anyone tested if the pvp penalty affects the amount leeched?

Mana leech works fine.