I guess we will have to agree to disagree I can see how someone can have a problem with bottom cushion sides being too tall in R-design and biting into one's thighs (I don't have that problem). But the tall side bolsters of the back cushion is what makes R-design seats appealing to me - that's what I mean by "lateral support". I tend to lean while cornering, and these are much more supportive to me than Inscription seat bolsters. Yes, they are inflatable so you can squeeze yourself in, but they are still not tall enough compared to R-design ones, especially in the upper back area. Also, having driven both vehicles for 2+hrs straight multiple times, my butt gets sore in Inscription, but not in R-design. Could be due to less padding to accommodate the massage/ventilation hardware, but I don't really know for sure. Just reporting my personal experience, YMMV, everybody's body shape is different.Genesmasher - I can't argue with your take on the sport seats, because frankly that is a personal choice. It might have been a recent issue of C & D that rated those seats as the best in the industry (or something close to that). Lots of people love the sport-seats and I'm not going to tell them they are wrong. I intensely dislike them and did not buy the R design because of the seats. To me, they're not too hard at all (I love firm seats) and the side bolstering is actually comfy. Its the bottoms, where the side bolsters cut into my thighs, that I couldn't live with. I badly wanted to go with the R design because I think the bursting blue is by far and away the most desirable XC60 color (and, yeah, I know that is a personal choice too). Seats were a deal breaker though.
I just spent five days in a loaner inscription (because of that stupid emissions light that comes on every 5,000 miles) with the ventilated seats. I didn't notice a bit of difference in the hardness of the seats. They felt nearly identical to me in overall comfort. And, I don't think either the ventilated or non-ventilated seats "lack sufficient lateral support." With the ventilated seats, the lateral support is adjustable anyway. Either way, I think the seats in the inscription are absurdly comfortable and just the right mix of firmness and comfort. Its the Volvo seats that were the deciding factor for me over the X3 and Q5 (both of which I regard as better vehicles overall, at least in some regards). I honestly can't imagine anybody not liking those seats.
My advice to everybody is always to try and make your own choice.