This is an awesome set up. If you have roofed and use a rope and harnesse you know how lame it can be, constantly tripping over the rope or tangling your air hose and rope. This spider self retracting lifeline allows awesome movement with no tripping and no tangles. Similare lifelines range in price from around 300 (only 9 feet, this one is 20) all the way up to $2000, ya wow $2000. I'm tossing in the harness as my body tells me real loud every morning that I am no longer a roofer. Looking for a quick sale. So first $100 takes it away. You can't beat the price.