The courses say that they go from beginners up to B2 which is an intermediate level on the Common European Framework of Reference for Languages (CEFRL). The lessons introduce new words with images, in context and pronunciation from a native speaker so the course is essentially has a flashcard based system. Written production (and even short audio recordings) is then corrected very quickly (at least for Portuguese) by native speaker users of Busuu. This way you get feedback on your output.
1. Corrections by native speakers – this worked very well for Portuguese at least. The corrections were prompt and accurate with feedback. A weakness here sometimes could be that other learners are rewarded by quantity and not the quality of the corrections.
1. Mnemonics – I didn’t find that the images associated with the word were are noteworthy as in some other similar language products like Memrise, for example (although personalized images work even better).
So would I recommend using Busuu?