I just purchased a new Leaf Credo 40. I own 3 Aptus 2 backs and so this is my first Credo and I am excited to use it. I see that I can use USB 3 or Firewire 800. I only shoot tethered in my studio, and I need about 30 feet of cable. I use a Mac Pro tower desktop which runs my Aptus backs with firewire and no problems. Before I buy additional cable I wondered if any of you might advise me on the best way to go. I see that I can buy a 30 foot firewire, no repeater or power booster, or I can buy another 15 foot firewire and use a repeater. I also see that Tether Tools offers a USB 3 kit with a power booster. I shoot products so speed is less important than reliability and having a longer cable to work with. Any advise or suggestions would be greatly appreciated.