I'm using it currently and in my third week. I feel like I've turned the corner and hopefully am in my last week. The photo period idea in the link is interesting and seems to have made difference in my case (see link).
I'd buy Seachem Focus which will binds the meds to the food. I'm also using garlic guard.
Good luck. I've also considered using Rudy's kick ick with the metron. By itself I've heard the Rudy's has a 25-50% success rate, but I was hoping this would increase in conjunction with metron.... , since Rudy's is supposed to kill the free swimmers and metron... anything that attaches to the fish. This would be a last resort for me and not sure if the two products are safe together.
http://www.seachem.com/support/forum...read.php?t=331