Q: “Durable,easy to sharpen,flight”?
A: I have had them bend on not-so-punishing shots in addition I have had the ferrules open up on the same blade-bending hits. Because they are concave, they are more difficult to get at i.e. sharpen. I feel the metal in the blades are difficult to get a nice edge on as well. On a brighter side, the flight characteristics are excellent, they fly like field points. They are cool looking and nostalgic, if you like them, give em a try. Have fun with it!
Good Luck -
Kris