(12 Jul 2020, 3:14 pm)streetdeckfan wrote IIRC, the main reliability issues with the X21 were caused by the oldest StreetDecks and since the 67 plates have allocated instead reliability has already improved. The 67 plates are also much improved from a passenger perspective as they're much nicer on the motorway stretch
My experience on 6332 would not come under "much nicer on the motorway" - topped out at between 47 and 49mph and struggled to get there.
On the earlier points - I'm 6 foot 2 and I find Streetdecks far more claustrophobic than any E400 I've ever been on. I was at the back of the top deck of a Streetdeck last week and by the time I got to Chester Le Street I was fairly uncomfortable. I've been at the front of the top deck a couple of times on the B5s and while slightly better than at the back, I always find that E400s let more natural light into the top deck.