I have never had one single issue with the MS and leaving me stranded..But just in case, I carry a spare MS with me..This car isn't a daily driver anyomore though. It made a trip back and forth from Grand Rapids Michigan to chicago, and many 1+ hour trips, and then to and from the shootout which was 3+ hours. Just made 9 passes at the drag strip a few weeks ago. Drove it home :) This was with the MS controlling both fuel and ignition.

Take your time building the MS, and also with running and connecting all of your wiring. Tripple check everything. Reliability is all in the assembly and install.