Very nice dressing William,
Re: “ Anyone fish this pattern? “
Yes, we carry them in our small waters boxes ( dressed heavier for pocket water and with fluorescent floss ), where they rest alongside another hot spot type attractor fly. The Sierra Gnat which is just a Griffith’s Gnat with a ( 505 ) fluorescent fire orange band of floss at the mid point. The latter I tend to use more often on still and slow moving water.