Jake from Verbling here. So far, most of our users are at the intermediate to advanced level, though we've got a bunch of beginners as well.
For beginners, we've built beginners conversation topics to provide some initial Spanish context to get you started. Click the "Beginner" button once you've got a native speaker on the other end.
My co-founder Mikael actually knew zero Spanish before the summer but just started using Verbling to learn (and get feedback). He's now very conversant, at the stage where I can hear him use phrases that real Spanish speakers would use in everyday life, which is often very different from what they put in textbooks.