I previously owned the Foundation 8 which was a very comfortable shoe that I use just for walking around.  I also own two pairs of the Asic Evolution 5's that I specifically use for jogging and running.  The cushioning on both of my Evolutions have worn out so I decided to purchase the new Foundation 9 to replace my older Evolutions as a jogging/running shoe...

I find that the Foundations, both the 8 and 9 feel like they have more overall cushion around the foot, however it does feel a bit heavy.  I am a severe overpronator and these shoes perform just as well as the more expensive Evolution 5.  They feel slightly stiffer compared to the Evolution 5 but this may change after it properly breaks in  I've only put in about 12 miles in them).  So far I am satisfied with these shoes which I use for running and if they continue to hold up, I may have found a cheaper replacement for the more expensive and great Asic Evolution 5.

Update (10/4/11):  I completed a half-marathon in these shoes and experienced blisters and pain from mile 8 and on.  I did not experience any pain whatsoever with the Evolutions in my previous half-marathon.  I previously used the Foundations for short, 3-mile runs and decided to use then on my last half-marathon which was a big mistake.  Nonetheless, I prefer the Asics Evolution of long distances over the foundations.