This past summer we were fishing the Restigouche in the begining of july. We were there for the first big push of grilse into the river. In the Restigouche you may only catch 4 fish total per day.
The green machine seems to me to catch a lot of grilse. Its not that i dont like catching fish, but I would rather fish a fly that is more prone to catching salmon. When that first big push of grilse came in i could have caught a grilse on alomst every cast. my young cousin did limit with 4 grilse one night all on the green machine.
Dries are great because you can see the fish coming and know whether it is a salmon or grilse. This helps me out when i have caught 3 fish and want to catch a salmon to end the day. If its a grilse I pull the fly before he can strike, if its a salmon i let it take.