Quoted from markmon:
As for flow, the ramps are buttery smooth and easy to hit. But the left orbit shot is ruined by the right pop bumper. The ball will hit the skirt on the right pop preventing left orbit from properly flowing back to the flipper. The right orbit is a fun shot and flows back when hit.
Obviously, Borg likes this design. He did the same thing with Tron. The right orbit goes all the way around, but the left orbit gets caught in the pops.