I genuinely don't think the ride is that bad. The first journey I had on one was from Manchester Piccadilly to Ulverston (a journey approaching two hours in length) and I found them perfectly comfortable, no worse than a Sprinter.
Then again I seem to be pretty bad at identifying ride quality in trains. Every time I hear someone say a multiple unit or carriage rides poorly (or well), I always have the same response of "really? I hadn't noticed".
I’ve tried them on several different occasions, on different types of routes, and the incessant *CLONK* sound when going over bits of track irks me to my very core. I’m not someone to usually notice bad ride quality, but it can’t be ignored. The build quality is extremely disappointing for a modern day train, it feels like they were rushed out as quickly as possible, with corners cut to save money, and marketed as “better than a pacer”, which, yeah, sure, they are, but this isn’t exactly a groundbreaking revelation
Like I’ve said before, if the majority of people who use them like them, that is the main thing. But for me, I’ve had more comfortable less irritating journeys on every type of sprinter. It’s not agenda driven, I just don’t find them good, at all