Overall our impression is that it Airflow is a good material, but their diameters vary a lot from one X to the next. For example their 2X was one of the thinnest 2X materials out there, while their 6X had was one of the largest.
The clear spools have a very large arbor, and the “hair tie” tippet tender allows the material to pull off the spool with almost no memory. The spools come with a built in cutter, (although a nipper is still better for trimming the tag ends off your knots). The spools do not clip together, so plan on making or buying a tippet leash.