Highly recommended!
I first started studying Chinese at Thats Mandarin years and years ago when I was working in Beijing. I was immediately struck by how different their teaching methodology was compared to other language learning programs I had taken. I was learning the vocabulary and grammar that I needed to express my own ideas and thoughts at that very moment, with lots and lots of spoken practice, rather than a pre-set course of words and structures that I would probably forget soon after. I eventually was able to get to HSK 6 (the old system) with the help of my teachers, but honestly I was even more satisfied with the progress I had made in my conversational abilities. I moved away and my Chinese got quite rusty. In the past year I had more time open up in my schedule, so I decided to go back to That's Mandarin, this time via online classes. It's still the excellent teaching that I had the first time around, and I've had a great experience working with Wu Laoshi and Wang Laoshi. Thanks to their help my Chinese now is even better than it was before, and I've recommended this school to friends and family who have expressed interest in learning Chinese.