I have used the intermediate Rio Tarpon line, which employs the Clouser line taper, as well as the Tropical Clouser line, and the Rio Mainstream Saltwater line which has a similar taper.. In my opinion, they work as advertised. I used a 10wt and 11 wt lines for casting flies, including some heavily weighted clousers, on hooks as large as 4/0 as long as 7" in overall length.