They obviously didn't think through privacy issues very deeply, since it completely crashed with the privacy policy when it was released. And the feature might

They obviously didn't think through privacy issues very deeply, since it completely crashed with the privacy policy when it was released. And the feature might be fine, but the UI is not good. It's confusing whether the big "sync" button says you are syncing, or lets you start syncing. And as this article says, when you go into "options" instead of clicking "undo", it starts syncing...