I probably can't give you the definitive answer you were hoping for because I don't own an S70. I'm aware that there are some differences between an 850 (which is what I own) and the newer S70s so how my experience applies to an S70 I can't say for sure, just so you know.
As you know, the IPD swaybars get high marks across the board from those who have tried them, the people that don't try them, always figure they'll end up with a poorer ride. Yes, you will end up with a bit less ride compliance over those one-wheel or one-sided shock motions--by definition, that's what stiffer swaybars will do, that is, make the suspension less independent if you will. How high you place ride compliance over performance is unknown to me but if I had to pick just the one single mod to do to the suspension of my own car, I'd pick the IPD swaybars. Overall, the swaybars and strut brace, had very little negative side effect to the car's ride (brace improved ride a bit actually). But, the swaybars improved the car's response quite drastically on my car even with the Bilsteins and lowering springs I did prior. Just so you know, I bought the car with just the standard supension (no "sport" suspension) so I had the smallest swaybars possible from the factory and, therefore, had a lot to gain from the larger IPD swaybars.
Simply put, if you're looking for a Lexus-like ride (which is impossible on an 850 or S70 mind you) then leave the suspension alone (or go get yourself a Lexus! j/k). I think the performance of the swaybars are well worth the slight loss in ride compliance but that's just me, a young performance-minded guy talking.
Good luck with it.
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