Speaking mandarin adds positive point at this experience, as it is important to understand better the real life and the culture of Chinese people, if you'd like to live her. The good points about the intensive program is that you're focusing only on your chinese studies and you're learning in small groups (4-5 students) which help you to improve and learn very fast! My chinese improved very quickly( communication+writting) : within 3 months! I would highly recommend the chinese intensive course!
I had an excellent teacher who was really listening to me, being a beginner it was not obvious! I stayed there for 4 months, and I returned to Shanghai for 2 months. Beijing is a beautiful city, so much to see, and the food is fantastic! I was there in the middle of winter, it is very cold, but I do not regret!