I use Fluorocarbon leader in clear to semi-clear water situations when fishing for salmon, steelhead, trout, bass, walleye, perch, crappie, you name it. It works great as leader but horrible as main line. Stren and seaguar both make high impact fluorocarbon leaders that work great. You only need this line if you want to present your bait or lure to a fish without the line that is attached being visible. If you don't care about the fish seeing the line attached then don't waste your money.

Just my 2 cents