I like the idea of a secure way to safeguard my private keys but I am also scared to put a bullseye on my private keys! I am unlikely to get my private keys stolen as an individual. I know it happens and it is heart wrenching for those people, but trusting a third party to safeguard my private keys seems like a bigger risk as they will be targeted by hackers. I wonder how this service can safeguard my private keys better than me? I look forward to reading their white paper. Just my 2 cents.