My thought on that is with any sort of electronic dizzy newly fitted, almost everyone feels a huge improvement.What is the collective opinion on the 123 distributor? Two restorers I spoke to a while back (neither outright Alfa specialists) dismissed them as "unnecessary" in a quite pooh-pooh sort of way which struck me at the time as being quite strong. That is a small sample, of course, and the dizzies have been around for a while now so one assumes they sell well.
But, that is mainly because we are replacing a dizzy that other than a new set of points shoved in it once in a while, has never been properly refurbished....I bet every old points dizzy is now worn out to some degree, be it the bearing which would make the dwell angle wander, or the advance springs tired - or vacuum advance etc...
If we took the time to really properly restore the old dizzys in every aspect (or buy a NOS out the box, you'd also feel the difference).....that is a fair amount of work sourcing all correct parts...
I did this to my old 101 Bosch points dizzy (before electronic dizzys were even about) and the improvement was dramatic.
an electronic one is just easier to purchase and drop in and forget about...(well, until the electronic gizmos start going wrong)