I own this mouse.

Pros: I have my follow, assist, and instants tied to it. That way i can thow my instants as I strafe circles around my target. They give you little tabs to place on the keys to train with, but after a while you don't need them. Once your thumb gets used to actually doing some work it's easy/peasy. I've actually considered putting my movement keys on my mouse, including strafe. This way I have complete control of my movement in my right hand.

Cons: Limited binding capability (new software on the way though). Not cordless! Notchy scroll wheel. It is small if you have Cyclops hands... but hey, I do have big shoes :P

This is an excellent mouse and certainly worth the $79 dollars if you don't mind changing your play style.

I just want to add that unlike Yaki, I've never had an issue with any Razer product I've owned. Of the four people in my house that play WoW or other MMO's (Myself and my 3 sons) there are x4 Tarantulas, x4 n52's (Belkin product, Razer software), x1 Mamba, x3 Nagas, and my dad and daughter are using our hand-me-down/up Razer mice (a couple of Lachesis'). Not one return. I've retired perfectly good Razer mice just to upgrade. And yes, I feel like I keep them in business.