Ive been using the same 6al box for almost 20 years. I bought a spare but have never needed it... Don't know how msd quality has gotten over the years but if it's like everything else... and on the ol' mans car we run the FBO 4secondsflat white ignition box. Dad has always ran the chrome box and mp tach drive distributor, but after the last one died switched to this. He loves it. Has a built in rev limiter.
https://4secondsflat.com/Ignition.html

Does anybody have any experience with Daytona Digital? Made in USA. I've been looking at it for a new build.
http://www.daytona-sensors.com/cd-1--ignition-systems.html