I put a Petronix kit on my daily driver 340 '69 Dart back around 2003. Never any problems, and it still runs today! (except someone else owns it now)

I personally have never heard of any Petronix failures. Plus, since then they have come out with improved units P-II and P-III. The price is right, and I recommend that you purchase their coil too.

However, I just purchased an awesome ignition system @ www.4secondsflat.com. I say awesome even though I haven't installed it yet, but if you check it out, I think you'll agree. They offer the Petronix Flame Thrower coil with their unit, and it eliminates the factory ballast resistor.