I don't have any experience with them, but a friend who shot them said that they were not as durable as other arrows. When you go so far one way on the design of anything, you will give up something else. They chose to make these arrows very light so it's logical that they would have to give up on durability. He said that they shoot as well as other arrows, but no longer uses them.
As zip4644 posted, be careful on total arrow weight vs. bow draw weight.