"20 trouble free years. (But I still carry around a points plate!)"
A true belt & suspenders man!
I carried a points plate for about a season before trusting my Martek optical EI. Must be 30 years without a hiccup and I check timing every ... ok, haven't checked it in at least 10 years. I think the LED may crap out any time just from age but it's still working so I don't "fix" it.