The leather they use is pretty thick and unyielding. I can sort of understand why it is so difficult to stretch proportionately on either side of the central seam. Anyway, they've stitched it longitudinally which is wrong. It should have been stitched across so that the leather has a smaller footprint and would show less deformation when a posterior, especially a bony one like mine, rests on it.
Present: Superman 330d sDrive M Sport + Toys (Auto Car: 0-60 in 5.5s, 0-100 in 14.2s, 30-70 in 5.1s)
Ordered: Red Tornado Golf 7R 5 Dr, DSG + Toys (Top Gear: 0-60 in 4.5s, 0-100 in 11.5s, 30-70 in 4.0s)