Dear roho,
The absolute value of flyline resides entirely within the mind of the user.
If you think a $ 75.00 or $ 100.00 flyline makes you a better fisherman then it probably will, but it in all likelyhood your success won't be the result of the new flyline.
More than likely it will be the result of increased confidence in your casting and fishing ability, and while that might be imaginary it does translate at times to the real world.
If you fish harder and smarter with a new line it's not unreasonable to give some credit for your increased success to the line. It won't necessarily be the truth, but what do you care if you feel better about what you are doing?
The best flyline made is the Cortland 444 Peach, presently known as the 444 Classic. It was the best line in 1987 and there hasn't been a significant development in flyline technology since then.
The worst flyline I have ever used is the 3 weight line I mistakenly gave to Dave Rothrock. Old Lefty here on the board, last May at the Jamboree.
I handed him a reel from my bag that I thought was spooled with a "quality" 4 weight line as Dave was preparing to cast a bamboo 4 weight that was a knock off of a Payne 100 or some other classic bamboo rod.
Dave proceeded to cast 90 or 100 feet of line, leader, and backing rather easily with that knock-off rod. Little did he know that I had mistakenly handed him a reel spooled with a $7.00 closeout 3 weight line I bought from Denver Discount Tackle.
It was an honest mistake, I have two spools for the same reel and I gave him the wrong one. It didn't stop him from casting that "junk" line as far as it or a "quality" line could reasonably be expected to be cast.
I don't like the line because I can't cast much more than 60 feet with it, so obviously the line is bad, right? ;-)
Buy whatever line you care to buy and go out and fish with it. If you work at the fishing the line won't be your impediment to increased success, I promise you that.
Regards,
Tim Murphy 🙂