I've had my FMS wires for about 40,000 miles and they work great.
I just did a tune up and inspected them and they look great. No burns or wear spots at all (gotta route them properly to stay off hot surfaces). I was getting my alignment checked a few days later and had the shop test the wires and they said they were perfect.
I was ticked when I first got the wires, because of how long they were, but once I routed them properly, they do what their supposed to do on my stock ignition. Probably overkill, too, but I like red.