The callback works great... Had my Mega 360 out on three trips, and it started blowing fuses. Originally thought it was a grounding problem, a power supply, and/or power cable issue. After running new wires, and really digging in to the testing, I have determined it to be the unit. They gave me the shipping label today. OF COURSE, I have to disconnect what I finally got tuned and setup the way I want it and ship it all back (and get a box to put it in).