What you are doing right and the others aren't is two fold.

First of all, you have a progressive series. A person can actually start from the beginning and work their way up to a conversational level. All the words are accounted for. You remind people of what is new and what has been covered already. You remind them in Chinese and use English sparingly.

This is the way that it should be done. After the initial stages, a language should be taught in the target language as much as possible.

The second thing – Lessons are introduced in Chinese.

I checked out your site recently and saw the site was on level 3. I tried out the premium features and found them quite useful. Kirin and Rapheal are also fantastic. They speak very clearly. I'm listening to your podcast when I'm on the run, walking around town, on the MRT, Bus, etc.

I'm looking forward to level 4. I think you all did a wonderful job on the level three lessons. The audio is clear, the native speakers are excellent, and the content is VERY well managed.