I waited about 1000 miles because that is how long it took for me to find this forums and the additional time to wait until the CS MMI to come in the mail. I have not ridden in a car with TRZ but as CWPspeed3 said above I hear they do a better job and I don't care about extra vibrations, wish I would have gotten them. Like others, I am sticking to the bolt ons and thus can take them off if needed. Just remember to enjoy the car, thats why you bought it right? If not you would be rollin in a prius.