I love the stuff. However, I'm with JG on this one... the spools are horrendous. There are the - let's call the disk spools - that are terrible. Then there are some than come with the "standard" type spool with the cloth that holds the tippet. Those are excellent. Why can't they use them for all of their sizes? That's all I'd use if they did. But they don't so I find myself using Frog Hair for trout and Umpqua Big Game Fluorocarbon for Steelhead applications. Problem with the Umpqua is that the Big Game at my local fly shop only goes down to 8 lb. In low clear, I want a thinner diameter. So I use the 7.8 lb Seguar Grand Max Fluoro, which is actually quite thinner than the 8 lb. Big Game. Works for me... But yes, those spools suck.

As for the strength to diameter, I think Grand Max is the best in my also very unscientific tests.

Cheers,
Mike.