Lets see here. i've have 5 head units, 2 disc changers, and a partrige (sp?) in a pair tree. (sorry, had to throw that in.) i've loved every one of them. some have much more audio controls than other. i'm curently using a XXV-01D head unit. i'll be using it till the day it breaks. i've never had a problem outa any of them besides something wrong i've done to em.