I have several of the colored ones and have for over five years. I was just looking them over on last full-cage clean out, and they're almost like brand new, no fading, no damage,
very little wear. Once or twice a month I run them through the dishwasher, and just spot clean daily. I have them in with a Grey and a Galah and they aren't really on them very often (like another poster, I have them by their food dishes). I'm not sure how well they dull the nails (I still clip their nails every couple of months) but they really don't seem harmful in any way. In fact, I have been through SEVERAL other types of perches and these are still around. I guess that makes them a good value.