anybody know anything about gabriel ultra shocks. i would like to get new shocks for my camaro. when i did the gas tank i noticed my shocks are a little worn out. i dont get sevre rear and bounce but when i unbolted them from the rear axle i noticed that they were "lazy". are this ultra shocks worth the few dollar more per each at autozone? whats the difference between the lesser expensive shock and the more premuim units?