The A-stay is a much more difficult method of construction. Unlike the simple, single-point junction of a wishbone - which is quick and cheap - the A-stay requires that two bodies be precision cut, mitered, and aligned in order to build a properly constructed and, of course - straight - frame. However, the price for this added amount of attention to detail is slightly reduced weight, additional stiffness and strength, and in the case of the Z1, an additional amount of ride-tuning capacity as there are more options for these seat stays than the wishbone style. There is a slight pricing premium for a Z1 - but Parlee believes they are able to deliver a product which is more than worth the extra cost - as do I.
To view and experience these wonderfully different dream-machines, come see us at Bike Gallery.