I like it, I clicked on US State Capitals and it started a card. My first thought was "I don't know many US State Capitals, how do I see the entire list to get started". So perhaps add a way to present all the info in a set so a learner can quickly be exposed to the "question/answer" pairs before actually being asked to provide answers.
Also, not sure if it was something I did, but after I cancelled a session, I could no longer start a new card set. I'd click them and they'd go into "my decks" but clicking the deck would only launch a context menu thingy to edit the deck properties. How do you run them?