I use a vaportrail limbdriver rest on my guardian. There are no cords attached to the cables, instead it is attached to your upper limb.

As you pull your bow back, the flex in the limbs draws you arrow up. As you release, the rest starts to go down. It is suppose to stay up 60-70% of your arrow flight.

I love it, easy to setup and tune.

Check them out:
http://www.vaportrailarchery.com/