Yes, they are very comfortable seats. If your on the road for a couple hours it's great to change positions by "tightening" the seats up. I can't answer your questions about a seat swap though, for me It seems like a moderately difficult task, for a Benz professional?? The PO of my 98 E300 spent an extra $800 for the Multi-Contour Seatbacks, but did omit heated seats...,oh well,it's still a southern California car, so I rough it without heated seats.
Paul
98 E300