I replace my line 100 yards at a time, not 60 or 70, because my the time the line is worn out I've already cut or broken off 30 yards of it! And I blood knot it to the old mono. I also use the blood knot flyfishing, and I even use a blood knot to attach my leader to the mainline on small streams or rivers where snagging on wood is likely - saves losing swivels all the time. I tie a real good improved blood knot and have rarely had one break before the leader does - it's one of the best holding knots there is. And while I have on occasion had a big fish get me into the backing, I have never lost one because of knotting new line to old - always broke him off at the leader when he spooled me.

No one else seems to use this stuff but I really like Duratuff XT on my steelhead reel - takes a lot of abrasion and is real good at holding knots. But I use Power Pro on my salmon reels - make real good downrigger line and I can lose a couple ounces when mooching because of it's tiny diameter. Don't us it jigging unless you use at least 6 feet of real streatchy leader material, however, learned that the hard way