I still maintain that the Omega remains one of the best motorway mile cruncher saloons from a comfort and lack of tiredness point of view, especially those with Elite cloth seats - though I found my MV6 leather seats to be ultra comfortable as well, once over the initial hot/cold that plagues all leather seats.
Not much gets close in its class, even now, for that. Modern cars are more powerful, more economical, better equipped, and seemingly better seats. But no other car can I get out of after 500 miles and not feel I could do another 500 easily.
A 900 mile trip to euroland with nothing other than comfort breaks and the Chunnel crossing was a breeze in the superior Silver Bullet, though we did share the driving stints. Arrived late in the evening, relaxed and chilled.... ....even when it turns out there was no accommodation for us because they'd cocked up the booking.