I went from stock Exige seats to full carbon seats (no padding). No problems at all. I also have Nitrons so the car is very stiff.I disagree :shrug:
I DD my car and wanted my seat to be more comfortable so my back wasn't sore all the time, so I re-padded mine and its great now. MUCH more comfortable.
Those are replicas. You can expect to pay ~$700+ for one genuine seat, not $400 for a pair.