Assurion covers everything. If it only covered cracked screens it would be one thing. My brother had a phone fall into some machinery at work that snapped it in half. Hard plastic case and all. $100 deductable and 24 hours later and he had a replacement in hand. Someone else i know had one slip out of a pocket into the snow (unbeknownst to him) and ran it over with a snowblower. blew it into several pieces. Same story.
and as for the argument that they can be had on craigslist cheaper, you never know what you're going to get on craigs list. At least a referb, while it may not be brand new, usually it at least looks and functions like new.
IMO it's more than worth it. Anything can happen when you're carting around an $600 piece of tech.