I would like to read and scribble on work documents (personal data, confidential documentation and so on) and regardless whether the device could be stolen or data unencrypted landed on rM servers, if there was a leak no insurer would help with that in terms of recovering losses. It is just not possible to use for business as potential for the damage huge.
Now I am not sure why would I take any chances even with personal notes, not to mention loading any personal documents on it and who knows who looks at it when they land on the cloud unencrypted. It takes only one disgruntled employee.