As daft as it is to have any sort of attachment to them, they've worked the area for 40 years, and to be fair, they have stood the test of time very well. Other than on warm days when you notice the lack of air conditioning, they do an exceptional job for their age. They carry large volumes of passengers, have reasonable acceleration and solid reliability for the short distance runs they operate. They have also had satisfactory PRM modifications fitted bringing them up to the standard of modern commuter stock. It's only the lack of A/C that lets them down. I would argue that while 315 seats aren't perfect, they are better than those on the Mk3 EMUs that succeeded them and indeed more comfortable than the solid seating used on their replacements. In winter I'm still quite content to use 315s, now that the novelty of using 345s has somewhat worn off. TfL have put the money in to look after them and thus they really don't feel like they're falling apart like some other newer classes of train do. It feels like they'd easily last another decade if they had to. There are actually very few classes of EMU that could be said about so far.