I remember a lengthy discussion either here or PT.com right after it was introduced. If I remember correctly, the consensus was that it would indeed help on cars that didn't have many other suspension mods.
it will most likely take some of the squeaks and creaks out by preventing the trunk floor from flexing... but handling upgrade?.. not so much
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Elwood:We're 105 miles from Chicago, we have a full tank of gas, half pack of cigarettes, it's dark out and we're wearing sunglasses.
Jake: Hit it.