I used to use mono (we all did, right?) but since the no stretch, small diameter, no memory super lines came out, I just can't go back to it.  When the super lines allow you to feel a fish fart 20 feet away, why keep using it?  The flourocarbon lines are basically a sinking monofilament right?  I know it has low stretch but it also has tremendous memory and you can't cast it.  Is it a 'knot' thing?