Before coming to Beijing, I had studied Mandarin in high school 6 years back. Naturally, I had forgotten a lot of characters and was not able to communicate as well as I had anticipated. Starting to learn again had its challenges - I often found myself flustered and frustrated.
While coming to the school, it's good to know that the teachers had the capability to adapt to my present level and were able to help me reach my person goals.
The unique teaching style of the That's Mandarin allows students to remember characters for the long term, and also provided me the ability to retain key grammatical structures. I think in a sense, this comes down to the management of the school, and the ease of communication between teachers who teach the same students.
To provide an example, during high school, I had a habit of forgetting characters a week after studying, but over here characters are reemphasized often enough to remember them for the long haul.
The other thing that was particularly useful was the fact that the all the notes were printed soft-copy & hard-copy. I was therefore able to go through my notes while sitting at dinner via my ipad or taking the train / bus / public transportation.