Generally pretty good and infinitely preferable to the tube. I don't always get a seat from Lewisham when I go through (8.30am ish) although could easily wait for the next train if I wanted one. The trains do get packed further down the line but somehow is not as bad as the tube, perhaps because it is above ground which is much pleasanter. And there doesn't tend to be the same regular delays and problems as on the tube. On the rare occasion something does go wrong you're a bit stuck if somewhere on route, but usually quickly fixed. [/u]