A couple of things occurred to me from a legality point of view - having never used the app. What is the situation if you record a call coming from a country where recording may be considered illegal? Does the recording happen automatically? If so, might you have a problem when you roam abroad and forget about your recordings? If the recordings are stored on Dropbox on a US server and the call comes from a US citizen in the US, is there a problem? If the recordings are stored locally (unsure) might you have a problem travelling to any country from which a call may have originated and you recorded? The normal everyday uses are interesting but you never know whether you could get caught out sometime with some weird combination of circumstances.