I bought one of these specifically for my photo printer and I was not disappointed. Sure, I could connect my printer with the normal "freebie" cable that came with the printer, but I'd be missing out on everything that this cable provides. When printing through this cable, my photos are much more colorful, have a wider gamut, and there's much more detail in the shadows. It also seems to correct blown highlights to a degree. The color temperatures are also a shade warmer through this cable, while the print resolution is increased. It's subtle but it's there.
Naturally, most people can't tell the difference but I know that I can. It's almost as though I'm cursed, though. I wish that I could make do with a free USB cable like I could before, but now that I've seen prints through this cable, I simply can't go back. Those who can't see the difference simply don't have the 'eyes' that I do. Sometimes I envy them, as printing is turning out to be an expensive hobby.
I'm so confident in this cable that if you were to show me two photos in succession that were printed through different cables, I'm certain that I could choose which one came through this cable. However, if I can't, then rest assured that whichever one is better will be the one that came through this baby. After all, such visual tests are flawed.
My only concern at this point, is the fact that while the printer is mainly an output device, it does communicate back to the computer at times (for low ink notifications, etc), and unfortunately that data has to travel backwards along the cable. Hopefully this doesn't confuse matters and display and "ink full" message at the computer when it really should display "ink empty." Only time will tell.
I just can't wait to see how good my photo prints will look after this bad boy is sufficiently broken in.