I’ve written plenty about speaker cables. And I’ve probably heard hundreds at this point. Sometimes the difference is dramatic – other times more subtle. But it might be the determining factor as to whether or not you enjoy your system or not.
Most enthusiasts (and reviewers) tend to just ignore the speaker cable completely. I, personally, wouldn’t underestimate its impact. As far as design, the geometry, length, metallurgy, dielectric, gauge – all of that matters.