Do You Use MiiVerse? What do you think about it?

Do you use MiiVerse? I've been with Nintendo for a long, long, long time and I've never explored MiiVerse before. I was taking a look at it today, and it actually looks pretty cool! Do you participate in it? What do you like about it? What do you hate about it? Just wondering what the general thought is on the service, it seems popular, active, and vibrant. Thanks for any opinions you choose to share! ^_^

-voy