Complete and utter bunk - BS
I have personal experience working for Best Learning and can provide specific and objective details of that experience to anyone interested.
Also I recommend looking at glassdoor web site for some objective reviews.
Most negative reviews are based on corporate Beijing schools. They have hundreds more locations spread throughout China.
IMO if you want experience China don't go to Beijing to work for anyone. Expensive, crowded, polluted, and beginning to be fairly westernized. Live and work in "real" China and go tour Beijing on one of the several holiday vacations you get :P