As of 2010, the Zip Slot Mortise Mill runs about $250, and the Pocket Zip Slot Mortise Mill is about $100. The Pocket Zip Slot comes set up to make 1/4" mortises, while the Zip Slot is set up to make 3/8" mortises. Bushing and drill bit sets for 1/4" and 1/2" mortises are available for the large mill, at $25 and $33 each. The Pocket Zip is limited to 1/4" mortises.
Setting the mortise position relative to a face is easy with both jigs. The Pocket maxes out at 1" from the face to the center of the mortise; the large mill at 2". When using the Pocket Zip, you set the jig to a layout line to position it on your work. The larger Zip includes a built-in ruler and stop system that makes repeatability much easier.
You can move the handle to each extreme of its travel and simply drill a hole, using either Zip Slot jig as doweling jigs, which works well. The drilling process is slow compared to biscuit joiners, Freud, and Festool.