I have bent 2 so far, standard plastic rear end. One was a spectacular triple flip with a pike twist at a regional, and the other was running down a track marking then twatting a big hole, wishbone first. Basically to be expected. lol
I would much rather they bend at a few quid a pop, then damage anything more expensive. Overall I am very impressed with the durability of my non squared X6. They also bend back quite well, the last one bent into a Z formation quite spectacularly. I used my panelbeating skills (or lack of) to beat it back into shape, and it's held up fine.
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Toyota nz engine history