Just returned a Rio Grand (WF3F) line to Rio because it had a very noticeable rough spot in the outer coating that felt like a rasp tooth going over my finger when I stripped the line in. It looked to me like a few fibers from the inner core were sticking up/out through the coating, or a piece of dirt had been in the coating when it was applied.
Wouldn't have been too upset, but this line was just sent to me directly from Rio's warranty department to replace a new Rio Grand WF3F that had so many memory coils (twisted core?) it looked like an old slinky toy floating on the water.
I also had problems with an Allen line I tried. I first tried a two color line and it had a very noticeable blemish (rough spot that I noticed when stripping line in) in the finish. Justin replaced it with a cheaper single color line (I ended up paying over $30 for a $10 dollar line
), but it had so soft a coating that the leader cut through the coating on the loop after only a couple fish landed.
So far the $10 lines I've bought on eBay have proven to be the best quality/bargain out there.
My limited experience with Cortland and SA lines have been good, but they are hard for me to find unless I buy online, and I think a lot of the eBay lines are very old stock that have been stored in an oven.
Not saying Rio and Allen lines are all junk, just saying I've had bad luck with them.
What lines do you find have consistent high quality?