This one is great for racing, but really vibrates at idle and low speed. It shows how much the stock mount gives, as the back end of the car really feels a lot more solid with this mount in.
But I use this one for my daily car, and it feels the same as stock, but is much stiffer.
I have been throwing the idea around of adding / changing some of the mount locations; as I think that the engine moves too much, which preloads one rear tire more than the other (not good since we don't have LSD's stock).