I've got two reels spooled with it, and I'd really have to disagree. The Stren has performed very well, much better than I'd initially thought. It's not even close to the hardness of Invizx, and retains its strength like Abrazx.
More and more, I'm thinking that I'll go to the Stren as a mainstay, depending on its overall durability. It has all the qualities I'm looking for in a line: great knot strength, it's easily handled, it isn't as hard as other fluorocarbon, it casts very well, and it's reasonably sensitive.
The more I fish it, the more I like it. Considering it's under $10, too, it's worth it.
That all said, I've had it spooled for a short time. It remains to be seen what the longevity is and how well it performs over its lifespan. All things considered at this point in time, the only line I've liked more is Tatsu.