I used this fly all the time in a variety of sizes. I bought these on my way to the Big Hole last year and the young guy named Stefan sold me some of these. Now I use them in size 12 for small streams and the big ones during a stonefly hatch or as a strike indicator with a beadhead nymph underneath. The work great, the only complaint is that the fish do get used to seeing them but I guess that is true of all good flies.
I use it all the time 
