I wanted to say first that no high-zoot bug-zapper ignition system is going to help your performance unless you're running very high compression, high RPM, forced induction, and/or exotic fuels. All they will do for most street type engines is clean up the low end emissions a bit.
That said, in the last 15 years MSD has won more races than all of the other guys put together. I've been running an MSD model of one sort or another for the last 21 years. Some of the MSD units I've run were simple single unit setups, some with multiple units and rev limiters. I've only had one fail on me since I've been running them.