MSD yay or nay

I have been running 6AL's exclusively since the early 90's and only had one failure. That failure was a 70's vintage 6C that finally gave up a couple years ago.
Just keep in mind that anything electronic can fail at any moment. I always throw a spare in the trunk if im going on a long drive. I do like the fact that the new boxes have plugs so it can be swapped in a few minutes.
For reliability it is also hard to beat the factory electronic ignition. But yeah, spare module in the glove box. If you have a spare you will probably never need it.