I drove a couple of ST2s and, while I'm not the skinniest guy on earth, I'm not obese by any stretch, but the lateral supports squeezed me too tightly. My ribcage pushed against them when I took a deep breath, and it was borderline claustrophobic for me.
Then I drove an ST1 and I felt like I was driving my Ti. Would love to have them re-skinned in the Ti leather, or just replace all the seats completely. ($$$