This fly came as an evolution of the Amber Wing Prince and Dark Lord as well as the Birds Nest and Hares Ear. It works great as a caddis attractor and general attractors. For me it came to be guiding on the Lower Sac and Lower Yuba for trout. I like it in sizes 14-16 during most caddis hatches and even down to 18 for some of the smaller caddis.