I've heard that the unilite distributor had problems with its optical system. Always concerned with any electronic distributor because I've had problems with them in the past.
My vega HEI distributor has failed several times (module goes out). Once even while driving on the highway. The lean burn ignition system in my dodge truck has also failed so many times, that I switched out to an old points and condenser system. The modern distributorless system in my VW has gone through so many coils that I now carry spares.
Electronic ignition systems work perfectly until they dont work at all. So just curious about the unilite system. My dads chrysler has one. That said, I think I'll carry a spare points style distributor in the trunk.