adjustables are a good and useful at any time.
if you take a moment to measure where the rear of the car sits you will find that, even right off the factory line, the rear is not centered and squared very well. adjustable panhard and LCA's allow you to correct this problem.
taking the time to properly square the rear of the car will help in any traction situation since the car will be tacking more true from front to rear and suspension travel will be along intended lines instead of jsut close to them.
the only real difference between going single vs double or bushed vs rod ends is how you intend to use the car and what you like to live with. personally i always go for rod ends because i prefer the precise, bind free, movement compared to the way rubber or poly bushings work. the trade off is that rod ends are solid and make noises that are somewhat disurbing to those who are untrained/not used to them.
ride quality does not seem to change very dramamtically between the rod ends and the bushings. it is a bit more firm with the rod ends, but it never seemed terribly different to me.
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