braided line works well on large rivers where long casts are the norm. It also is a great product where heavy line is used. You can down size your reel from something that holds 200 yards of 40 mono to a smaller reel and still fit 200 yards of 50,65 or 80lb braid on it. Makes for a more comfortable fishing day. Braid excels when fishing chinooks in rivers like the Skeena and Bella Coola.
You can use yellow Fireline (even though it's really green) when fishing coho's. If you are worried about the bright color putting the fish down, just color the first 5 to 10 feet of it with a permanent black felt marker. If you have 20lb braid and a lighter 9' casting rod, it makes a great spoon/spinner casting combo.