16 years and counting on the first Pertronix set I bought.
I think I got 16 days and left high and dry 160 miles from home. It was a first generation Pertronix though, but put the points and condenser back on and never had an issue since. Once you have been bitten by the aftermarket product, it is hard to go back for a second try. I would only trust GM HEI, but that is just me and my hangup.