For tech people, we've had the most questions regarding our API (password resets, one-time pads, custom encryption) and also the ability to have custom installs that are separate from the multi-tenant instance (e.g. we now have a paid plan for agencies that does this).
For non-tech people, we've got a lot of feedback along the lines of whistle-blowing, "if only Anthony Weiner had known about this", etc.
Edit: and yes, just to be clear, we do not look at the secrets that we keep. We encrypt all secrets before they're stored. If you include a passphrase, we use that as part of the encryption key and we since don't store that passphrase we have no way to decrypt the secret. It's technically possible for us to decrypt passphrase-lee secrets but we'd have to go out of our way to do it.