ive had my tokico set up for over 3 years now and they feel as stiff as the day i put them in... i didnt get the adjustable ones but the performace ones work great.. but im thinking of getting the adjustable struts for my rear.. ive noticed that when im gunning it and when i shift.. the back squats a lil.. i was thinking i might be able to reduce that by getting adjustable struts in the rear and adjust them to be a lil stiffer... but that wont be for a while till the struts i have wear out.. but so far im pretty happy with them..