As far as I'm concerned, fireline is pure crap!!! If you don't go fishing more that twice a year and have never used anything else it may seem like great stuff.
... but compared to Power Pro or Spiderwire it sux hind teat big time!
Spool up a reel with the fireline and cast it all day, that black coating comes off quickly... and guess where it goes?... on you, on your rod, on the boat!!!... you look like you've been charred by a fire at the end of a day of using it, I'm sure that's where they got the name!!!
When the black coating comes off the line, it weakens very quickly!!!
Do yourself a favor and avoid the fireline... or you can learn the hard way, like I did.