Having owned a few 4D's, watch the nose crashes, the center spine will poke through the top. I added a small amount of electrical tape around the end to add extra cushion and make it less likely to poke through. It's an easy enough fix if it does happen though. Also, the center T is another weak point. I do know they "beefed it up" a bit, just be careful. I only fly mine when the winds are really light. If it gets up around 6-8, I've got plenty other stuff to fly.
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