I just replaced mine last week. I ordered the original one for $140 versus the $300 Maxim. I am sure that the Maxim is better but considering that my original lasted this long (installed by factory in June '05) as a 2006 model, I am not too bothered about the replacement. The new one is clear- what a difference. Since I have only owned the AS a year and a half, I do not know the degradation rate. I do know that my AS was stored by the original owner outdoors in FL.