PHB's are strictly a lateral brace. One side is fixed to the frame, the other side is fixed to the axle on the opposite side (typically). The stock mustang suspension benefits greatly from the increased lateral rigidity and is much less unpredictable with one than without. Stock suspension cars will tend to see some binding at the more extreme articulations due to the dual triangulated control arms trying to move in directions they can't. Stiff bushings exacerbate this problem and lead to things like snap oversteer.
With a PHB the wheels of the rear end will move in an arc up and down. This causes variable traction as the suspension articulates and is considered by some to be a serious downfall of PHB's. I like mine but you must understand that you'll turn better in one direction than the other with a PHB setup.
Watts links are similar but due to their design the wheels move straight up and down during suspension articulation and that leads to a much more predictable car at the limit of tire adhesion and less binding. Watts are few and far between because they tend to be significantly noisier than most people are willing to accept.
If you want to see full benefit from PHB/Watts you need to address the triangulation of the upper arms at a minimum. Steeda's 5-link does a fair job (but I still hate that design) of putting a PHB and re-angling the upper arms and performs quite well for most. I prefer the torque arm design made by Griggs or Maximum Motorsports. MM would be my choice for street cars, Griggs for race only cars.
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