In reply to LDWme:
I’ve used it for a couple of years and found it pretty good, although never really used the user created routes so can’t comment on that.
I recently switched to Anquet because, despite a much clunkier UI, the print quality is significantly better. I found that the OS site uses a relatively low quality file and contour lines in particular can be hard to see. It was always fine on a screen though, so if you won’t be printing much from it then it shouldn’t really matter.