I am particularly annoyed by the name "Whisper" for the "25 seconds only" messages: It got me to read on because I thought they interfacing with WhisperSystem's protocol for TextSecure. Because, open protocols, federation and all that. Would have been nice, right?
Well, thumbs down for that.<p>Also, if you don't trust the other to not <i>want</i> to log your conversation, don't send sensitive stuff. But then again people do seem to like snapchat and thelike, so I shouldn't judge too much there maybe.