Yup, Nanofil rocks, been using it for a while now (I'm surprised Mike turned to the dark side, lol!!)
I find that after a while the first 6-8ft or so will start to absorb water and start to sink. Just cut that off and you should be golden when the cold weather gets here. I know it doesn't retain water like FC does... I use 6lb Nanofil, it's like dental floss and casts a mile!