[birdman]

I think the difficulty in fishing these patterns relates more to how they are fished. They can be very difficult in moving water as they tend to ride low and are tough to see. You might try dropping one off of a large dry used as an indicator. This will enable you to watch your larger point fly for strikes. Terrestrials should be included in every anglers fly box. Try a quick google search on fishing terrestrials and techniques and see what you find.....