I just had a wheel broken off and a pouch torn on my last trip. I love how neither the airline nor manufacturer cover it.
I like Samsonite's spinners a lot, but Briggs and Riley is the only company that has unconditional lifetime warranties :|
OP should do ok claim wise, considering it was not an "extension" of luggage that was damaged, and that the contents were damaged as well.
Hope they get full value!