I only did the free trial and it looks like a premium product already (finished first 2 lessons using all the tools), you can´t get access to the supplementary material only (which is obvious as it´s too good to be free) but the rest is all there: audio lessons which are self-paced and very nicely taught by Nik and Paul, the voice recognition part so you can try and get results on your pronunciation comparing yourself to the native speaker (it works really!), the good idea of having all translated so no need to guess, and finally the tests and quiz so you can see how much you could improve. There is no time limitation on the trial which is great, but once you get to the culture lessons you´ll need the full version but more than willing to pay after being a high-quality product. Keep the good work!