Looks and works really, really nicely. I am currently in the midst of cramming Spanish (trip to Barcelona in two weeks, trip to Cuba in four months, woo hoo!) and I've been using these two trips as a motivation to finally learn the Spanish I've always wanted to know.

I've been using Duolingo a lot, as well as Memrise. Memrise has been quite good so far, but it is certainly not very polished, whereas this seems extremely well-done.

Congratulations on the launch, this looks like a superb product and if it works for me I'd be happy to pay for it. That's a clever idea for in-app purchases too, by the way.