Swapped out the stock shock for a Penske 8981. Casual riding doesn't seem any different. Installation was a bit of a pain because of limited clearance due to ABS on the right and shift servo on the left. However. it CAN be done! Patience helps.
How many miles on the AE when you swapped it out with the Penske?
If it was less than 10K or so, doubtful that you would feel a major difference in casual riding. However, hitting the canyon sweepers and technical twisties might yield a different story.
The stock shock is actually not too shabby when it's still relatively new. But somewhere around the 15K-20K point, it's definitely falling off the pace and it's not designed to be rebuilt
Regardless, once you get that Penske fully dailed in, you'll love it...