I like your fly, AlanB, and also the concept of tying a fly that floats, as well as fishes, well. - the 2 are often interconnected.
In that regards, in just the past couple days I read where Craig Matthews said that his Amber Iris Caddis pattern was the best caddis pattern ever devised by man. What a bold statement! While it may be a good pattern in some circumstances, it isn't the best floating pattern when tied as he recommends, which thus limits it's usefulness in certain faster water situations.