I went on it yesterday! Spent ages milling about Stratford International waiting for it to show up, but I got it! I loved it - it's a huge step change in quality for the DLR and takes the network from feeling like a fun novel rollercoaster (as I've seen it said online) to an actual, serious-feeling rail line. It's modern, and the internal displays on the sides of the carriages are used very usefully, providing info about the next station (what side of the train the doors open, interchanges, etc), compared to the 710 internal side displays, which just shows unhelpful info. The announcements were very loud, and so was the 'beep' before the doors close (not the hustle alarm, the long beeeeep). I hope they fix that, as it was almost too loud, even with AirPods in. The front seats seem like Elizabeth line seats, which is cool, but I'm not certain. Weirdly enough, the onboard maps/interchange info didn't show the new Overground names, and the PSA onboard did all the announcements manually for interchange stations (well, Stratford, West Ham, and Canning Town where I got off.) Maybe they're not done yet. They are really nice trains - very quiet internally, and has elements of TfL's new (I suppose not so new anymore) CMF design language, with brushed metal highlights and little hidden roundels. All in all, a long wait, but a worthwhile one. I look forward to the day they dominate.