I would say worth it. Just traded in my A4 with 77k on the clock and the headlights felt like 60 grit sandpaper. I'm putting some on even if its just clear to soak up some road rash. I'll change it out when it looks ruff so at least the lights will stay looking clear.
As for the coloured ones it's a personal choice. I like them, I'm just not sure if I would have them.