Pertronix got a bad rap, but most problems I saw where related to wrong installation/parts.
1. use the coil they recommend
2. use the wires they recommend
3. biggest common mistake: never put the positiv cable on the positive side of the coil (which will burn out the module after it run just fine for a while) It really needs to be directly on something from a keyed source. Never use the pink resistance wire from the ignition.
4. get a Ignitor III (don't even think about I or II)
5. Some tachometers mess with the system. If you run into trouble, disconnect it first and see if that is the source.
Frank
