Wow, the " I love the Ned thread" morphed into an "I hate Nano thread". I've used 6,8, and 10 lb. I have it on every spinning reel except two maybe. I am thinking of when I might need to regress back to mono.
I simply have not had the problems you describe. I don't break fish off with it. I'll assume somewhere along the way I have, but less than with mono. When I have, it's been a leader issue. I broke a couple off on Norfork on 1/6/15.
I'm not sponsored and I gain nothing from anyone else using nano, mono, fluro, braid, or sewing thread as a fishing line. It just puzzles me how my experience has been so overwhelmingly positive using Nanofil and others find it to be an expensive, miserable experience.
The two negatives I have with it 1) the twist in it becomes visible and it is more difficult to get out of the line than mono. I can remove most of it and it is largely cosmetic and not (so far) hurt my fishing and 2) it gets pulled on by the wind worst than mono. It weighs nothing and has surface area so it shouldn't be a surprise. The work around is to keep the rod angle low or even allow the nano to float on the surface of the water.
I'm back from my trip south. I took three spinning rods with Nanofil. I caught 115 fish (not impressive really). I lost one lure to a sunken tree and one lure because the hook eye wasn't closed completely and I was using a loop knot. Zero leader failures, zero nano failures. Easy casting, easy strike detection, and easy hooksets. I still love it.