if it's not broken, fix it until it is?
the multiple spark at idle was an amazing improvement ... over breaker points. just as the difference between breaker points and any transistorized electronic module system like Duraspark is Night & Day
does your engine run poorly at idle? think about possible camshaft lobe / lifter wear and degrading valve sealing quality as a cause. a worn / stretched timing chain may also be a contributing factor. when was the last time the plugs and leads were changed?
Duraspark is a fantastic system that will be hard to beat, and a replacement system will have its' work cut out for it by trying to earn it's worth vs cost
the P-E system does look like a great way to go ... if you didn't have a perfectly fine operational system in place already