So another journey on a GWR 800 today pretty much sees me admit to the rest of the criticisms I'd not yet observed first-hand with the units. Yes I didn't find the seat comfortable (though I actually find the shape of the back and the hardness of the cover worse than the lack of padding on the base) but nothing new there. The PIS display is really flickery, I don't know how I didn't notice that before - that's really quite bad and, honestly, probably almost as bad as I've seen functional PIS displays get (the bottom being the ones used on 465s), faulty ones notwithstanding. Fortunately it is still legible and you don't need to spend too long looking at it as it's in a relatively unobtrusive place for most passengers. If I was in the seat adjacent to it and facing it, though, that'd drive me nuts after a while.
The seat next to me was heavily stained, the unit I was travelling on was one of the first in service (800003) but still, that's quite a lot of muck for one year's service considering seats on the early 345s still largely look immaculate. The power sockets went off while the driver changed ends, not something I remember happening on other stock (clearly the whole train seems to reboot as the A/C goes off during that time too) and the grounding (or lack thereof) on them is really noticeable, I haven't had that 'fuzzy ground' feeling so pronounced on my laptop before, and I've been using this model for 2 years now. Seat reservations were not in use because the train was shortformed. By using RTT to identify the likely platform for the service, however, I was able to board the train first so this ended up being a positive for me as I was guaranteed whichever seat I liked. There didn't appear to be anybody standing but for an off-peak service almost every seat in standard appeared to be occupied. For a Bristol service, the 5-car unit seemed to be 'about optimal', however I imagine it would have been a bit of a squeeze on its inbound journey from Cardiff. Ride quality was much better on this unit than the newer one I used previously, and there were no rattles from the interior trim and window blinds this time.
Interestingly on my return journey (which was an HST) I noticed an 800 arrive at Reading on diesel and then pan up, despite having originated from Swindon. Do they not pan up any earlier than that Eastbound these days?