I've built a couple of Forecasts but no Rainshadows. My eight weight is rated a 10 by one fly shop fellow who tried it. The others were 5-weights that have a smooth casting motion. Not the fastest things in the world, although I'm still trying to get my cerebrum around that. I wouldn't hesitate to wrap another one nor to fish with one. Especially the lighter weights. My eight can strain a bad shoulder now and then, if a rain is forecast. Is this where they got the name? JW