Value proposition is fast search trough database of text content. You could store canned responses to email there or anything else that you use Notational Velocity or similar software.
You are right, copy needs more love.
The best way is to try it.
If data is stored in database at server, than there is no sync between devices, right? If you access it on the phone and from desktop, you always get latest data?
Sure. Voogla (http://www.voogla.com) supports that. You and wife login with same email and you can create, view and edit all notes in real time on any device.