For all lighter uses,4lb up through 15-20lbs I use a J-Knot and have a no problems with it. Give it a shot!I got it from Yamamoto's INSIDE LINE via I THINK it was Steve Lucarelli.... For HEAVY to HEAVY ,any 20 lb+ combo I might be more inclined to Uni-Uni it. A GREAT article ,also showing a DIAGRAM of the J-Knot, as well a uni-uni... http://www.bassresource.com/fishing/fluorocarbon_line.html