The rM is best thought of as a pen and paper notebook, except of effectively infinite size. There are no apps. The UI (the only user-facing program) has minimal features, most of which are there just to mimic what you can do with an actual paper notebook. There are only a few exceptions, like being able to drag your notes/scribbles on the page. The device won't integrate with any 3rd party services, it doesn't have search, etc. If a physical notebook doesn't have it, then the rM probably also doesn't.

That definitely makes the rM a very niche device, but I'm getting great use out of mine, while I never managed to get much good use of an iPad.