Mathews Switchback, Hoyt Trykon, Ross bows, AR bows, Bowtech, a few from PSE, Browning, Martin, Alpine and just about every other bow company out there.
The question is....why?
__________________
1995 Ford Ranger XL
Douglas Radial Tires
Super Blue headlights
Fiberglass front bumper
2400 pounds
The limbs cancel each other out in the shock department. The theory is that they move directly away from each other. Non parallel bows the limbs move away from the archer, both at the same time, creating the feeling that the bow is gonna "jump" out of your hands. The parallel limbs move straight up and down both equally opposite of each other. They are also said to be quieter as well, but I am YET to hear a bow as quiet as my UltraTec.
__________________
1995 Ford Ranger XL
Douglas Radial Tires
Super Blue headlights
Fiberglass front bumper
2400 pounds