They are very nice units, but starting to look a little tired. Although given the controversial 'prepare people for the 700s' refresh, things are starting to wear. There are many problems with internal gangway doors (was on one recently that had one door missing entirely!), the ball vents for ventilation are mostly broken or inoperative, and they're looking a bit tatty.
Externally they look good though, when cleaned.
I do hope that wherever they finally end up, they're giving a better interior look as there's no reason they can't be made to look as good as new.
On the plus side, they're generally very reliable. A few external problems, showing up in the recent hot weather, but nothing exceptional.