I don't understand how this is "unobtrusive"... it sure takes up a lot of your screen to see your notifications. Even on the lockscreen.
How do you access it? It didn't really say on the website. Also, no status bar icons? Those are the best notifications, IMO, because you can see them without having to open anything. The UI here does look clean and polished, but I would really like notification icons in the status bar.
So far, LockInfo has been my favorite notifier app. I have it set up to basically mimic the Android's [far superior] notification system. Text messages, e-mails, missed calls... they all add an icon in the status bar. Then if I want to view them at a quick glance, I just swipe down on the status bar, which brings down the InfoShade, giving me previews of everything (upcoming calendar events, unread texts/e-mails, etc).
So while I'm curious about this new app, that website really doesn't explain much of anything regarding how it works. I would really like to see something like I described above.