Iron grip, Iron will UNIQUE armor

Got this nice armor as a drop from minor boss and I think its insane. But I have no idea how much is it worth or how good it really is so would welcome some discution about this armor. also looked at trade and noone posted iron will or iron grip armor for sale at all.

Iron grip - 1% increase projectile attack dmg per 2 STR, STR no longer provides bonus to life

Iron will - 1% increase spell dmg per 2 STR, STR no longer provides bonus to life