I find them very pleasant, and far far better suited to intercity travel than the 350’s, which weren’t much more than a glorified commuter train with a trolley service (particularly the 350/2’s, nasty things!)
I’m interested to hear what people find so unpleasant about them? I’ve ridden several in the last few weeks and had no issues whatsoever, comfy enough, almost all seats well aligned with windows, great number of table seats, nice vestibules (the main problem with 350s was the lack of a vestibule turning into glorified commuter stock)
One criticism I have is if you sit right under the pantograph, the neutral sections are extremely loud indeed and sound like a loud hammer smashing the roof right above you.