Tuf-Line and other spectra products are unbelievably strong and thin. They can't be beat for deep fast water fishing with minimum weight. I use 65pound Tuf-Plus for Columbia fall hogs..it is unbreakable! I can hold the bottom with 10 or 12 oz.while my partners are using 16 oz.It is the ultimate pig-pullin'line. No stretch.
The problems:
1)Cost is about $34 a spool of 300 yd.s
2)Special bumper knot tying is kinda a pain.
3)Line is so thin, testing a tight drag often results in a sliced hand or finger.
4)If not spooled on very tightly, it will bite down 'into' the spool if drag is snug and a fish is peeling line quickly.
5)It will not break. Snagged on the bottom, your transom may be pulled under before the line will give in.