Twc_cableguy
I use one of the Ultra Fi Firewire cables - their Basque. Really nice improvement.
People need to speak from experience rather than speculation in order to be helpful to the original poster. That happens way too much in this hobby.
I had the same experience but with Audioquest.
I ran the Audioquest Diamond FireWire between Oyen Digital housing (twin 4 TB Hitachi Deskstar drives) to Mac Mini. In my system the Audioquest was worth the price, perhaps not in another situation.