Compared with 1st generation DMUs of the time they must have been amazing
I never travelled in them, but by pure chance I saw one of the Midland Pullmans in the summer of 1960, and it must have been more or less in their first week of operation. This was actually before I ever picked up my Ian Allan spotters' book.
I was awe struck - I had only thought such trains existed in the USA. Of course, it was the colour as much as anything - no other train was blue at the time - at least, not on BR. (Oh, I suppose there were the early AC electrics - but they were way off my limits at the time.)
But they - the Blue Pullmans - did have a name for rough riding, at least on the Midland. Not sure if they were any better on Brunel's railway.
ps In later life the full yellow end rather spoiled the classy look of the Pullman coat of arms of the early livery.