Are the Mancini Mag mounts any beter than the stock mounts

Ripped 3 sets of stock mounts s replaced with Shumacher the poly locs , but tired of the vibration they pass through the car so wondering if the http://www.manciniracing.com/enmaset.html
will hold up as well as the poly mounts
http://www.manciniracing.com/enmaset.html