A wire's resistance rating goes through the roof when heat is applied to it,that's the main problem,ever seen a wire after a short circuit has been applied to it? it's pretty ugly and renders the wire useless.In the four years or so that 've been using deans plugs I've NEVER had one come loose during a race OR during a wreck.I always use new plugs AND wire when building batteries,You should replace your wiring and plugs at least once a season anyway,for efficiency reasons.The key to the deans plugs is not to over heat the plug while soldering the wire to it,it's not hard at all once you've done it a few times.