Nothing wrong with the old Boyar mine was on my Norton for 32 years without any problem except when the battery went bad, still going on another Norton but I replaced it with the JH Maggie and its even better and no need for electronics to run it.
Ashley
Ashley, I'm not trying to rain on your parade; your devotion to the Joe Hunt mag your Commando wears is legendary and has always been informative and, clearly, your implementation of the JH mag gives you a solution that justified the cost and the freedom to worry about something else. In that vein we are brothers.
As a stand alone ignition system, independent of the motorcycle's electrical system, a magneto is in a class by itself and a staple for piston driven aircraft; quite an endorsement.
A new magneto, however, is 3 to 4 times more expensive than an entry Boyer or Pazon (others mentioned as well). A mag sticks out so far, when cam driven, that it begs to be knocked off; do owners of accessory mags' (mounted to the timing cover) ever wonder, while in decreasing radius right, how close that mag is to kissing the tarmac? If you answered yes then you have compromised your safety.
Given that a lot of Commandos prowling the roads today have OE wiring harnesses a new mag might be considered cheap insurance for getting home when the electrics melt down. Consider, however, that a new harness and a low-end EI are less expensive than a new mag.
The idea of a mag which doesn't care about battery condition very much appeals to me; if there was a safe place to mount one on a Commando where it would get adequate cooling and have a decent automatic advance I'd buy 2.