This 3sixty.1 is awesome for cleaning up the signal from the stock headunit. It analyzes the output of the HU and then automatically smooths out the response. Also have adjustable graphic EQ. Accepts line and speaker level inputs. Much better than a LOC! It also provides an aux in so you can run an ipod and satellite radio if you want to.
I upgraded to the 3sixty.2 and so no longer need this. Comes with all accessories and box. Accessories include a calibration CD and remote knob. $165 shipped OBO.