RE: Mathews and the Zero Effect
If you decide to get one of several newly designed bows that captivate the cables, be very careful to inspect the area of the cable captivation periodically. The upper cable captivation is done directly in line with your eye. If something comes loose or breaks, it could launch parts directly into your line of sight.
The Mathews design utilizes e-clips, which we know can come off. If this happens and the axle holding the small rollers slides, you could get a roller launched toward you. In a design by another manufacturer that I saw, there is a locking design on the cable slide. In this design there has already been a case where the cable guard broke and the shooter was injured.
I'm not saying that any design is bad; just that you should be aware of any inherent potential problems.