Petronix thoughts

I have a 65 273 and I am getting rid of my dual points distributor for the obvious reason of not wanting to fool with it. I have a mopar distributor oem that the previous owner slapped a petronix box in. I also have an orange box and wiring harness so I could buy a electronic dizzy if necessary. But I just wanted thoughts on the petronix as I have never tried one. It's just a street car so I'm not really concerned with power or ability to handle it, but I just can't grasp how this simple magnetic box does everything without an ecu.
Thanks
Joel