Do know that you can only really heal yourself when your armor is gone, which Isn't always good.
Meaning your lifesteal will be limited by enemy CC.
What? Since when?
I have never seen that.
I think he meant that the heals don't actually do anything until you lose your armour and start taking real damage. The healing is constantly in effect based on the cyan-coloured numbers that appear above your character when you hit something, but if your armour hasn't been broken and/or you haven't been hit by piercing damage you should be at full health anyway.