It works as advertised. Being able to keep the factory amps and chimes is a plus. All I did was matched the wires up to the radio and worked like a charm. You can also adjust the output so that the radio signal matches the Bose amp. The only issue I have was the unit itself is kinda bulky and had to squeeze everything into a tight place in my Cadillac Deville. If you are like me and wanting to get rid of the factory radio this is your best solution.