I've heard the term " bad spool" used here on BR, and by some local fisherman I know also. The complaints go like this: 1. The line breaks too easily. 2. Poor knot retention. 3. Twist easily, and hard to manage. 4. Faded or poor color. I used to think I had gotten a " bad " spool, mostly when using spinning reels. Once I learned how to properly spool my reels, much of the problems went away. There was a show I've watched occasionally called How It's Made. The show focused on manufacturing all sorts of things. One episode was about nylon fishing line. The line is manufactured to tight tolerance. And the sheer number of yards that can be made in one day is staggering. Two years ago, I spoke with a rep who worked for a company that made Stren and many other lines, both mono and flourocarbon. He told me that today, the lines we're buying are far better than any lines made in the past, going back to the 1950s and 1960s. He also mentioned that the Japanese have perfected the manufacturing process, and, in his opinion, make the best quality lines available. In all my years, I cant honestly say I've gotten a bad spool. I've had a couple that I wondered about, but I used them and they fished ok. I'm sure it's possible to get a bad spool of line. It could happen, with any brand. In your experience, have you ever gotten what you perceive as a " bad" spool of line?