I usually have a 2 slots orb that provides +X enchant for the mercenary. You don't have to waste any skill point.
Attack rating boost is great, indeed.

Ya good shit.
My inventory is full of skillers/mf res scs. I roll with 8 slots. It's kind of hardcore, but I want every boost possible. I'm not much for putting things in and out of the cube for more room either. I guess it could add 24mf lol.

I use a ethreal obediance on switch for my blade fury sin, too bulky for what you’re doing but great for melee builds, really notice the attack rating bonus and level 21 enchant lasts a longtime

Ya I bet!