I have only run my dex410 about 10 times, and sure, have had some hits, but nothing that would bend alloy I think..
Still, yesterday, I didn't even crash, but after landing a long jump the shock tower just broke from the left side (near the spot where shock is mounted into the tower, leaving the shock hanging loose with a piece of the tower).
I guess it was already broken because of some earlier hit, and just came off after the jump. Hopefully the replacement lasts longer, but I have to say I would feel a lot safer if the towers were made of alloy