Fantastic multi-use long line!
I bought both the 10m and 20m a couple of years ago. They get very frequent use and are still in excellent condition, no signs of wear and when they're dirty I just dunk them in a bucket of water.
I use them for teaching recall, limiting the distance they can swim in open water and tie them to cork stakes when I go camping.
1 extra tip, don't grab hold of the rope if you need to stop your dog, just stand on it or lose your skin to rope burn!