Just installed the SU motormount. Shifting is improved about 100%. Previously, smooth shifting under any sort of power into 2nd or 3rd was impossible. Mazda screwed the pooch on both the clutch action and the mount stiffness. There's also another mod to move the clutch pedal takeup closer to the floor... but that's next weekend. NO ****, the wife won't let me do anything to this car without her approval. She wants to drive it for awhile with the new mount to make sure she likes it.

Here's a link to my writeup at mazda6club if you're interested.
http://forum.mazda6club.com/index.php?showtopic=71747

 

must be nice working on a brand new car, not having to constantly break bolts and stuff