I have it on my 4 wt for backing and it works great, though I have not had the pleasure of seeing it "due to a fish" since last summer!

my favorite set up for a low-water drifting set up is using a triple surgeons knot to tie a leader on, leaving a tag end (on the mono) for a bb shot. I have never had a break at the surgeons knot.

it is probably one of the most popular lines in the South now, we use it on everything from Tarpon to Trout (or Specks as they call em)