I visually inspect the strand from time to time for small cracks.
Being held down by one foot, if it snapped, it would probably just hit the floor, so I'm not overly concerned.
That being said, the Elastikon and lifter's knee wrap options are not going to snap.
I did a comparison test last workout, and am likely to shift mostly to them.
The Elastikons allow smaller increments in resistance than the knee wraps, but require footwear.
With the knee wraps though I can kick off my sandals, as they work comfortably under the arch of my socked foot.
I don't use the plastic sleeve with the knee wraps, as only an inch of the band under the outside of the foot is in light contact with the floor.