How'd these feel while all on the car? How were vibrations?
I currently have a set on with a Cobb RMM and honestly I don't even feel any bad vibration, rattling at all. I can only speak for the motor mounts as I have both passenger and driver side on. I'm not sure how or what it would be like with the OE filled RMM. I had extra eurathane so I just filled it thinking someone will only be interested in an OE filled RMM along with an extra set of motor mounts I had. Stock OE motor mounts were useless to me, so I filled them to sell them to someone looking for a set.
I know a lot of people are thinking 80A... heck that will rattling the fillings out of my teeth, but the reality is it's nothing like that. There's only a hand full of us that are running OE mounts filled with either 60A or 80A eurathane, so not many have caught on but I think once the word gets out on how comfortable these are it may be a popular option for many.