This is Mystic's top of the line waist harness - super comfortable. It retails for $289+tax. It uses the BOA technology which allows you to adjust your back support by spinning a wheel on the outside of the back plate, while on the water. You can make it as stiff as necessary and avoid back problems, as well as make it super comfortable and fitted to your body. It also has the HP Leash system, knife (integrated with the Clicker spreader bar) and killer looks.
I used it for one season - it is in excellent/perfect condition. This is size Medium. I'm often at 3rd on the weekends if you want to check it out.