I have had it for about a year and a half since Nintendo sent it to me for having a Ancient Club Nintendo account, something about loyalty this and that.
Pretty cool, there's supposed to be an update coming out sometime this year adding the ability to share flipnotes and stuff to the hatena, but Its probably going to be put on hold til Nintendo of America fixes their stuff on parental controls.
They seriously need to stop babyproofing their systems, its hurting them more than what its supposed to do, hopefully Nintendo gets the point, I mean you can swear in the Miitomo app, so I hope that's a good sign of things to come.