I for one, would never trust an application that used encryption without the ability to audit it.
What encryption standards are they using, if any? 3DES? MD4? MD5? AES? SHA-1? None? Something they invented themselves?
How do we know it isn't something lame like:
Code:
XOR + "Handango" * pi
Without the ability to audit it (and a way to retrieve the data from the desktop, in some platform-independent way), there's no trust. Without trust, there's no way my own data is going to get stored in it.