Tried to resist commenting, but can't help myself!
Last January, at annual, it was time to OH the mags and I chose NOT to go the Surefly/EIS route. Here was my reasoning:
1) I have read multiple threads, here, and elsewhere, of various 'issues' with these electronic ignition systems, both installations and operation.
2) I have NOT had any problems with my stone-age "Tractor Mags." This is a GOOD thing!
3) Performance improvements with electronic seem marginal, at best. Aircraft engines are stationary, and I think Lycoming did a pretty good job of optimizing timing even if it is fixed.
4) I can already operate as "deep" LOP as I care to.
5) As a career EE, I have seen far too many examples of applying new technology/complexity just because it exists. IOW, a solution seeking a problem.
6) What was a dual, independent of external power, system now requires a power source. I'm a firm believer in the KISS concept
7) Easier starting, cold and hot. While I've scared myself with a couple of hot start situations, I've never been stranded. And, since adopting the Don Maxwell method I've had good luck.
8) Lower overall cost due to the 2000 hour TBO. Very true, but didn't outweigh 1 through 6 for me.