I purchased the 15 foot long firewire cable to connect my 24 iMac to a HD Motorola DVR. The cable construction was as shown in the picture on Monoprices' web site and the connectors locked in nicely. I recorded a few music concert programs and the image and sound appear to be high quality. The image quality of HD streams off WETA is amazing. The cable is doing a great job with no signs of problems and the construction and material are of high quality.
Cable stiffness is a "pro" for me, as it keeps it in position. Blue color. Much more convenient than having to look for a USB 3 port on the back of the computer, this cable remains connected to the computer and the end sits on my desk.