In preparation for Etoile, i built a trio of *15 weapons around the idea of life-steal
And it works great, with Ultimate Chain healing me for amazing amounts of HP and letting me stick to the bosses without a worry.

....only if you learn even a single point in Damage Balancer (Which you need to, to access to the 155%x2 damage increases) the healing from any and all weapons is then reduced to 1.

So basically, all my effort to build/affix life-stealing weapons was rendered completely useless for the class i wanted to play