Im going to be ordering my new head unit later on today, but I would like to know if anyone has/used this type before and how well it works, I'm getting it because it has 3 pre-amp settings and had a USB and AUX port on it, my old head unit has neither of these and I'm only using CD's which get scratched way too easily. Thanks guys. heres a link to view it http://www.sonicelectronix.com/item_35579_Clarion-CZ501.html