Lots of folks have problems with lots of things. Pertronix needs the proper voltage range, at least 3 ohms resistance from the coil, and they don't like it when you forget to turn off the key for a long period of time (coil doesn't like it either). Keep in mind that we hear more from people with problems than we do from those who are happy with their conversion. Your choice should be based on what YOU want. Pertronix looks more like stock and is easier to install and less expensive than the Mallory setup (at least the one that I am familiar with). But if you want a bad*ss ignition system to go along with the other high performance upgrades you make, then you may want to go with the Mallory or something similar. I went with the Pertronix and cannot believe the improvement it has made on my 235.
