I'd bought all the parts to build a nice set of OEM-style replacement wires for my A12 Road Runner using Magnacor components, but never finished that project before I ended up selling the car. Scott Brown spoke highly of them (and, yes, was also a dealer for their products) at that time.

I have MSD 8.5 "Super Whatever" on The MoPig currently. If/when I need to replace them, I'll give the Firecore 50s a try, but would be surprised to see any detectable performance improvement from them.