I tried urethane and couldn't stand the vibration. Great mounts, fit awesome, absolutely sucked in the driveability category. Like 0 out of 10.
My mirrors (both side view and rear view) vibrated so much @ idle I couldn't even see out of them. You can just imagine the dash etc.
Stock redtop SR btw. 4 cyl have a sweet 2nd order frequency imbalance due to the lack of power overlap per crankshaft rotation. Anything with 5 cyl+ won't have this problem.
Nismo's do an amazing job of compromising between stiffness and driveability.
I currently run Nismo mounts and they are beyond perfect. I'd give them a 9/10 purely because of cost. Fit perfect, run perfect, there is nothing else I can say?