Just because the rope is made of Dyneema it doesn't necessarily mean that it is a quality winch rope. The Dyneema fiber that we use is sk75 Dyneema, it has proven itself to be a quality fiber that is durable and strong; it has been used with great success since the 1980's when Amsteel Blue first became popular in the fishing industry.
The rope listed above is probably an imitator made by a company that doesn't have the same production or quality control standards as the companies that make ropes for the big name companies; the ones who have been dealing with these ropes for 15 plus years. Be wary of any ropes called blue steel, blue synthetic or anything of this nature as they are imitators of Amsteel Blue.
-Alex