I’ve used East Coast First ex Aberdeen quite a few times over the past few years – daughter was at college in Leeds so it was usually the best option. Strangely enough, on a couple of occasions I got First fares that were only between £5 – £15 more expensive than Standard. I don’t know how this happened, and I don’t know if it still would, but certainly great value for me Aberdeen/Leeds (via York).
Whilst the carriages are tired, the service more than makes up for it.
Every staff member on every journey have been outstanding – I’ve done weekends and midweek, and the drinks/food hardly stops all the way down. One Friday afternoon I think I had 3 red wine/sleep cycles which certainly passed the journey very quickly!
I would highly recommend it – especially if you get lucky and find the cheap First fares I happened to find.