If I'm not mistaken the blue label is fluorocarbon.
I use it for my top-shot on my trolling outfits.
I'm familiar with their tippet material for my freshwater fly fishing (been using it for about 5-7 years). I also buy the 1000 yard spools for my Bass reels I use straight line, no power pro. IMO it's the best line out there.
It's just a shame they only make it up to 25# in bulk spools.
FFY