I'm quite surprised by this comment. My 88 300E has leather seats. I don't know if they are any different than MBTex, but they are the BEST and most comfortable seats of any MB, or maybe any car I've ever owned. This includes my 210 that I bought in 96 and ordered with heated, orthopedic seats.

Not only are they extremely comfortable on long trips, but they have held up perfectly in the 278000 or so miles that it has traversed.

I wonder if maybe the seats are just not a good fit for your particular body size and shape?

Best of luck,