Well I only had these arrows for about 3 days now, and I am them out of my new Hoyt Vipertec. I bought them because my local shop told me they were some extremely durable arrows. I bought the 340's and already have two that have hair line near the insert. The new hit inserts are inside the arrow to give better alignment of your broadheads. But I hope these arrows can hold up better than this. I ve only been them for 3 days and I did hit something in one of my hay bails with the one arrow but have no idea why the other one is ed. Any other reports on these arrows.