I think I will be also going for the ST over the CSS one. Comparing CS/PP vs CSS vs ST using a ARB stiffness calculator, one can see that the CSS is only 18% stiffer, whereas the ST is around 110% stiffer. This might sound like a lot, but is near the extra stiffness that a typical upgraded ARB offers in most cases, it's not exactly comparable to say spring stiffness where an extra 50% can already feel like too much. Furthermore ST is one of the mildest upgrade options (H&R and Eibach are even stiffer) and every ST review I've seen has only positive comments with no mention of noticeable ride impact.
Thanks for the info, just ordered the ST Black ARB based on the above. Plan to put the CCS Arb on eBay now.
I would be interested in it, but If I change it this year I'm going for the ST also
