Very good way to exercise your English. I still do not know how to get better in grammar but everything else seems perfect: vocabulary, expressions, talking, metrics, evaluation in terms of % or ABC12, etc. The interaction with the tutor is quite fluent, although it is necessary to wait some seconds before answers are elaborated. Anyway, it is really friendly, and jokes, surprises or other feelings are well detected and processed. I am happy with this new AI application. Almost real and metrics are amazing to situate your position in the English language marquet!