I bought this unit after seeing some good things about it on the internet. I installed it in less than an hour with the helpful kit that Sonic Electronix sent with it. The radio has an amazing array of features and sound settings. I used the 3.5 aux input for my satellite radio and it works like a charm. I'm very impressed for this unit at a price that was pretty awesome to boot! I have this radio feeding 3 amps and it raises the roof!! The USB feature is quite nice. Fill up a USB device and listen all day!