Will a cheap Amazon speed rope work as well as a premium one?

For casual cardio, yes—high-volume retailer reviews and a high-trust mainstream tech-press recommendation back the sub-$10 ball-bearing cables. Specialist jump-rope community members push back, though, noting that premium PVC ropes with string cores feel smoother, last longer, and resist kinking better than pure-PVC budget cables. The right answer depends on whether you're jumping a few times a week or daily.