I have taken Zumba. It's fun but it really depends on the instructor. (like Jam) I'll say that the requirements to become a Zumba instructor are much more lax than those of BodyJam.
It is a latin dance based class. Typically the music ranges from Tango to Reggaetón to Salsa... As I previously mentioned, it depends on the instructor. Try it! It's nothing like Jam. Nothing is.
If you're always looking back, you'll miss what's ahead.