Doubtful. Remember if it is call 'firewire' it must meet a standard spec. So, the issue is does it meet the spec or not. If it does not meet the spec, the cable is defective, quality has nothing to do with it. How would one know if it is meeting spec? Testing it. How do you test it? You really can't with mega bucks of test gear. However, the standard's organization, located in New Jersey does some testing/certification. Try them. Most pure differences in cables are always due to one not meeting the spec, not its pricing.
