I like them a lot, but don't be tempted to do as an RC article advocated a while back, namely just fit the Easycap without disconnecting the existing internal capacitor.
Bad plan indeed Rex. Was tempted to send Frank W a note but held back.
One hears of folk who get away with it but dunno for how long.
If a condenser were typically to fail 'open circuit' it would be fine - but they very mostly don't.
The boring thing is disconnecting the old one, especially if buried in resin on a K series.
The less boring thing is being able to check by substitution in a heartbeat afterwards, if in doubt, without taking anything apart or off the bike except the contact breaker. That, for me anyway, was the holy grail - having suffered from premature rewound armature 'failures' which weren't.
Initially I and the late KenF thought maybe best to treat the green maggot as a regular service item, as we all used to with points and condenser sets for old cars back in the day. But haven't found it necessary in real life, so I don't even carry a spare on the keyring any more.