$20 is all the difference between the real deal and the cheapo, I know it is $20 but it is much stronger. I will agree with the WHEN and not IF situation, I have flipped mine, hit stuff and landed hard without breakage. I have torn up a couple of props mind you, and still survived.
I on the other hand, would rather come out of a wreck with no damage, to having to replace arms as soon as it hits something. But that is just me.