I've been using an addon called Mutilate from Curse for this same purpose. I'll give this one a try as well. Seems so similar, I wonder if you're the same author?

Edit:
I did in fact decide to switch to Vendetta from Mutilate. Side by side, the addons give nearly the exact same rotation, with one small difference. Vendetta adds Vendetta as a part of the rotation, where Mutilate offers it as an option when it's off CD. Either option is good, but visually Vendetta is more symmetric and that appeals to me. Also, it has an option for "energy delay" or something of that nature to compensate for lag. So far I haven't messed with it, but it is nice to know it's there.

One question, is there a way to adjust the visual "buttons" of the addon with something like the old Button Facade, which is now called Masque? I know Vendetta doesn't use actual buttons, but it would be nice if the look and feel of the icons could be customized.

Thanks for the help.

Impressive addon but i would very much like if it had an option so we can make our own custom rotation to be used.

Impressive addon I must say. If I may, a suggestion, allow Vendetta to be queued much the same way vanish is. Vendetta is optimally used at specific times instead of just on cooldown.

Aside from that, great work.