My msd box(digital 6+) gave me smoke signals when it failed on drag week last year. It did give me a little notice though, it started to smell right before that lol. Actually it didn't want to start at the checkpoint just a few miles prior to where it died. I had a coil go bad on me last year on drag week as well.

My biggest msd problem is a digital 6 I have that misses in high gear. I replaced the box and the miss went away. I had msd check the box last year and it worked fine for them. I had to use that box as my spare this year and sure enough the high gear miss was still there.