As far as the course goes, I started with number one just for context and I am now on lesson 57. I am not sure what level my Chinese actually is, but I have known most everything on the lessons I have finished so far. Although, it has been a great review for me on grammar, vocabulary and tones.
I have enjoyed listening to you and Kirin a lot. I think it was a great idea to have listeners from many different places, but overall, I would agree that I prefer to listen to Kirin’s Taiwanese accent. Also, I just finished the level 1 review (lessons 58, 59 and 60). I thought the format was very challenging (in a good way). It seemed that throughout level 1, you would say something in Chinese and ask for a translation into English. So, the difference in the review, where you spoke English and asked for the Chinese translation, was both welcome and challenging. I enjoyed it and would welcome more lessons like it.
Finally, I think more reviews and mini-reviews would be very beneficial. I know that in the course you build on past lessons and vocabulary, but little quizzes in an English to Chinese format are great as well. Keep up the good work!