not sure how many are using these so I thought I'd give a quick impression. I installed the inserts and fired my speed up and let it sit for a while to warm. Jumped in the car and didn't notice much of a change in vibration. Just a light vibration which was barely noticalbe at idle. I didn't pick up any kind of interior rattle, and that drives me nuts so I was really happy about that. Took the car out for a quick spin and everything felt very tight and precise. Gave it a mini romp from a stop a didn't get that hopping/ skipping feeling that you would normally get. I am very happy with these inserts. I think I ordered them on a friday or saturday and had them before the next weekend. Two thumbs(yes)