The lights on her 180 ZT-T (now sold to my daughter, Amelia) were really bad after 160,000kms in the Aussie sun. They were becoming quite opaque and discoloured. Her partner Ross bought a similar kit and spent a similar number of hours to bring them back to clarity (see photos). Not sure how long they will last though - that sun is pretty intense! It would be nice if the covers could be bought separately from the whole light fitting. I assume they just clip off, but most threads on this issue indicate that you have to buy the complete lights to get new covers. This might need to be a future product for the shop.