I use Cortland lines, and tippet material exclusively. I really love the new flats taper and bonefish tapers. I use the guide as well, but I'd recommend cleaning the guide line regularly. They cast great, but if you lay them on the deck of the skiff all day in the extreme sun, they can feel a little gummy if you don't wipe them with the cortland line wipes regularly. I don't ever have any coiling issues, but I fish in 80-100 degree weather primarily. The flats taper or bonefish taper don't need anything. I drag them through the trenches and they never fail me. No tangles, not knots, no gummy feel, just flawless performance.
Their leader and tippet material is some real next level stuff. It's virtually unbreakable, and the fish don't get leader shy. I've definitely caught many more tarpon and bonefish since I made the switch over from using Seaguar tippet.