The SS are pretty soft to start with, somewhere between touring and sport on the OEM TT suspension. Their response isn't quite as linear as they heat up compared to the mono flex model also, the springs are not as stiff as the flex models'.

the older version was deemed not compatible with the EDFC controllers in the Z. The main reason for this was that the actuators were big and bulky and didn't fit either under the hood or under the plastic in the back, the new ones will fit with only a little modification on the backs. (fronts are no problem)

Price. SS saves you about 400$

 

Look at you ballin' with the Ben Franklin sticking out of the rim! Totally classy!

All sarcasm aside, that's a pretty nice rim. I've always liked the five-spoke mag style rims, and 18" looks to be a pretty nice size for the Z32s.