My husband has two decks: Universal/de Angelis and Fey. He uses them from time to time. Actually, he looks at the pictures on the Fey but turns to the Universal when he does an actual reading, which is two or three times a year.
My seven year old son has a Whimsical and a Hanson Roberts, and he's not happy with either. I wasn't comfortable getting him some of the ones on his wishlist because they have nudity that just doesn't seem appropriate for his age. He has a notebook that's officially his Tarot notebook, but he hates writing so he hasn't done much with it.
My mom has two decks, the Hanson Roberts and the Tarot of the White Cats. She's thrilled with both of them because she likes for things to be sweet and light, but she rarely does a reading and if she does, she'll usually ask me what it means and then she looks it up in the LWB to confirm...usually the LWB sounds like a fortune cookie and has nothing to do with what I just said, so she sighs and puts the cards away again. My dad bought her two actual books on Tarot, but she figures that if anyone knows the meanings of the cards, it would be the author of the LWB.
So far, my four year old son does not have a deck, but he loves to look at the pictures in the decks I have and he has definite preferences, such as the Druidcraft.
I haven't converted anyone else yet...