After using Alderlines nearly 2 months, I can say that the product is absolutely essential for every boater. I have 39 ft Dragonfly 1200 docked at river with the ocean access. Docking is very challenging since currents are changing with tides twice a day. Additionally, with every passing boat there strong disturbance. The dock lines a holding very well. Materials are superb with great abrasion resistance.It does absorb shock nicely. I did follow instructions and my boat is perfectly aligned and stabilized even with frequent tide and current changes. The product addresses several issues: shock absorption, boat alignment with the dock, and keeping boat close to the dock with tide variations.
Unlike other products, this dock line from Alderline is a complete solution built to last for many year. I would recommend it to every sailor without hesitation.
CPT US Army