I just smashed my quad today. I think that one blade of a prop sheared off at the hub during flight and my quad hit hard from about 30ft. I totally smashed one arm of the frame and bent the skids, but that appears to be the only damage. I sent a quick email to Jakub and he sold me a spare arm. I got an email response in about 2 mins, so can't better customer service than that. Just frustrated at knowing I'm gonna be out of action for a week or 2 while I wait for the spare arm and props.