I bought three new S-lines - a least stretch, a medium stretch, and a most stretch. All three measured on the short side before use. A couple of lengths of the line with the most stretch were out of tolerance short before use. After use, all lines and all loops measure in tolerance. I expected that the softest line would stretch the most with use, and it did . The medium stretch and the least stretch lines stretched less. All brands stretch some with the first several uses in my experience. My S-lines are all now in tolerance and have a good feel when skiing. I cannot discern a difference between the least stretch S-line and a standard Masterline. The medium stretch feels like Masterline's optimized line to me. Don't rely on me or anyone else when selecting a rope. You should experience them yourself. The S-lines are a great value to me.