Original Spiderwire

When Spiderwire first appeared on the scene I purchased a 1500 yard spool of 50 lb. test. I used it for everything including surf casting. I know there have been many improvements over the years with micro fiber braided line, but I never kept up on it because I had gone back to mono full time.

Given the fact that I have so much of this stuff left, I want to know if it is worth using, or should I just switch to Power Pro or Fireline? What was it about the original spiderwire that caused them to go away from it? I never had problems with it, I just switched because mono was just so much easier to fish with (knots, breakoffs etc.) Does anyone have any good things to say about the original spiderwire?

Thanks in advance.