Simon -
There's a joke that MSD stands for "Might Suddenly Die".
I have not used MSD, so I shouldn't comment on MSD performance, but from what I understand, the Duraspark Devices are reliable under normal operations.
I have not had an issue with the Duraspark in my vehicle under normal driving (and it was in the vehicle for 50 K miles) - until I burnt it up by leaving the key on for a long time.
Regards -
Rocky
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