I installed my Corksport inserts today. Literally a 10 minute job once you get the car jacked up. I used a garage lift, so it took me longer to actually get the car aligned on the lift than it did to install the inserts. Take the 19mm bolts off the tranny mount and it's an easy job.
Impressions... feels like stock, although throttle response is better and it seems as though it breaks the tires loose alot easier when I lay on it in 1st and 2nd. Torque steer seems to have gotten a bit worse with the inserts, but it's managable. I have to drive it some more, but overall, for $35 and 10 minutes install time, it's a no brainer.