The same amount of material is taught at all levels. What is taught changes. Dancers will benefit equally from taking any level of instruction and, as each level builds upon the one before it, will usually improve their dancing more by enrolling at the lower levels.
Learning to dance, and dance well, is a life-long opportunity. Paradoxically, the best dancers will often be most aware of their need to improve. For our instructors, this class is an opportunity to improve their dancing and teaching.