I have been taking Taiji classes for over a year.  There are a couple of things that are important to me:

1.  The teacher sets a pleasant atmosphere.  I felt comfortable as a new student in a class that includes more advanced students.  In fact, the advanced students are very helpful.

2. I was surprised at the workout one gets in a Taiji class.  You work at the level you are comfortable with.  Just as important is the engagement of the mind as one focuses on isolating movements.

I highly recommend this class.

Yasmin