As someone who was part of the Tsinghua-MIT IMBA program I can tell you through first hand experience that the overall program leaves a lot to be desired.
Although it is often ranked as one of the best universities in China, and the relationship with MIT Sloan is highly publicized by the school, I was quite surprised at how badly run the IMBA program is.
There are definitely some quality local and international students that you will get to meet in the program, but the number of students that would typically be unqualified for a typical Western MBA is astonishing. A number of students are in their early 20's with little, to no work experience. Also, some students are admitted purely based off family background, despite the fact that they are clearly not capable MBA candidates.
As for the MBA program staff, they do genuinely try to help students, however it is so unorganized and under resourced that they are heavily reliant on students themselves to come up with ideas and put in the effort to run the program. The processes and policies are not consistent, and there is strong favoritism that goes on to particular individuals, depending on their background.
Which brings me to my final point regarding the teaching staff. From time to time you will get some visiting professors from MIT running one day lectures, and there may also be some foreign professors who teach certain courses, however the majority of your courses are taught by local Chinese lecturers. The local Chinese professors are usually quite bad in that they often times have poor English proficiency (at least not enough to be able to teach a core MBA course), have no practical experience or real-world experience whatsoever, and are stuck in the traditional Chinese way of teaching which is so narrow minded and unwilling to consider outside viewpoints.
I know that this may appear to be a bit of a rant about the Tsinghua IMBA program, and is quite negative. I just want to give you all a real representation of the program from the point-of-view of someone who has gone through it. I really do hope that the school and the program office can get their act together, to make it the great program that it could be, however I don't see this coming anytime soon.
Going to Tsinghua will give you a good chance to experience China and understand the challenges, however do not go there expecting to get a professional quality MBA experience and education.