Silent Circle is for business use to avoid industrial espionage. If you are an activist or suspected criminal I would imagine they would cooperate with any court order to feed you a malicious update that allows federal access just like Hushmail does. They swear up and down this is impossible but it's a for profit business they arent going to risk it protecting whistleblowers, wanted hackers or enviro activists. Redphone at least you can build it yourself and prevent targeted updates