Most of my classes have been very good. I was fortunate to be able to afford to go to Empty Spools for the first 5 years after I started quilting. I enjoyed each class. I have enjoyed every class that I have taken and it has run the gamut from local teachers at LQS's as well as nationally known teachers.
Most of the teachers had very good people skills and made their class fun. A couple, including one well known one, needed a little more polish on their people skills and making newer quilters more comfortable with the technique they were teaching.