This is pretty fun, and it only takes creating about 4 messages (you don't have to send them) to unlock the photo attachment, 3D pen, and stationary features.
The presentation is the usual cute Nintendo/Mii theme and the tutorials happen in the form of pretty cute notes from "Nikki". Sending notes is fun and indeed, I had 5 notes from NWR friends as soon as I downloaded it and my system Spotpassed.
For some reason, Flipnote Hatena was daunting to me, but this has been a lot of fun to casually doodle with.