(16 Aug 2021, 9:18 pm)L469 YVK wrote GNE's X21 funnily enough (I do have flaws with GNE too), I was actually disappointed (although the recent changes reveal why) when they split the original E400MMC order that the X21 wasn't considered. StreetDecks again, I don't personally think they're suited to the X1 and I'd hope that GNE have a succession route for them when better times allow or worst case, replace after 5 years.
As a passenger, the new StreetDecks are far superior to the E400s, they're more comfortable, feel more spacious and most importantly have head room up stairs.
Mechanically, they seem to have made a lot of changes since the Angel batch so it'll be interesting to see what the reliability is like.
The 16 plates were (and still are) fairly unreliable, but the 67 plates seem to be fairly solid.