Like I siad I have seen a few pics, but everyone I know using them has not had a problem. They seemed to hold up well for the WC guys I can't recall anyone not finishing a race as a result of broken XO cranks. I'm not saying they can't break, just saying they have not proven all that fragile in my experince.
The Thaw was good fun, thanks for the link to the photos.
I'm making a quarter jar for you that you have to feed every time I see another photo of you looking back to smell your farts while doing a kickout like that. Double payment every time your front wheel is twice the elevation of your back wheel.