Dyneema is a remarkable material and it is true to say that it has revolutionised sling production. It has several advantages over the traditional nylon webbing. For a start it is incredibly light and strong, it is also less susceptible to UV degradation and is more abrasion resistant.
There are other advantages too which will help you when you are out on the crag. The skinny profile of the tape means that you can take advantage of much narrower threads and the sling is less likely to slide off marginal spike placements.