I am sure there is a thread of this but i wont try to find out what that thread is named.....
So: since daggers r used on both hands does that mean u get twise as much energy from a zealous dagger and a vampiric dagger, than swords?
i.e: a vampiric dagger does it get 6hp each hit, and does a zealous get 2 energy each hit???
There is a chance you will do a double hit, which makes you attack twice as fast (0.95 seconds as to 1.25 seconds normally) Double hit will trigger Vampiric and Zealous twice, so yes, you will get +6 HP or +2 mana. But only if you do a double hit, if not it is just +3/+1
Also, -1 HP regen is 2 HP every second, with an attack speed of 1.25 (or 0.95) you get 3 HP, so vamp balances out and actually helps you.