We do have a slk and that is how I found out comfortable those seats are, but it has the standard mechanical leather seats like the cloth base model. my wife has the limited so I have sat in both and I still prefer the slk and that is why I put some slk seats in my base model. As far as taking long trips, the slk seats are far easier on me. another thing is that the backs aren't as thick as the limiled seat, so you can go back further or recline further and do to the perforations in the leather they are cooler. try to find a slk on a sales lot and try them out. there is a bit of a difference between the slk powered seats and the mechanical as far as feel, even though they look similar, try both if possible, you might like the mechanical better. I lucked out and got them for $400 off ebay.