Rotor actually made some cranks before they made oval chainrings where the left and right crank arms were connected by linkages so that the cranks would not be 180 degrees apart at TDC.

Q-rings are pretty expensive just to try, although supposedly there's supposed to be a company enforced 30-day satisfaction guarantee return policy to let you try them. There are cheaper options coming out of China if you just want to try oval rings.