So i was a bit skeptical about these collars actually working at first but i went ahead and bought them because i heard great reviews about rigid collars. At work i installed the collars and torqued the bolts afterwards to 80ft-lbs the factory spec and went for a test drive. The car actually drove stiffer, and corners on somewhat bumpy road felt tight. Although The difference wasnt night and day. The vehicle really did feel solid. My only complaint is that the collars could be a bit thicker, some gaps were not completely filled which bothered me because the whole reason of this mod was to fill in the holes..
Over all i would say it was worth the purchase, i dont regret buying these collars and the handling feels great.