Since nobodys mentioned this element, I'll say this: A real veteran jedi guy was leafing through my junk bag one day; and pretty much said "uh oh" when he came across my rio stash. I was advised that rio lines tend to dry out and crack sooner than airflos.....'based on his experience'; which is very substantial. This guy fishes with the top of the top. Lo and behold, with even usage on both; both being bought at the same time? My rio started to crack into its 3rd season. Wasn't treating it with anything weird. Clean all lines in a mild soltuion of baby shampoo and water. I keep them out of the light and let things dry before bagging them up. Airflo heads are on their 5th seasonand starting to look like it might go. So regardless of performance, there's some experience on durability foreshadowed by someone else who experienced it first. Sure, formulas and recipies for the plastic may have changed since '09. Just saying.