NIA!

I'm pretty excited, tonight is my first Nia class at the High Point Community Center!  Here is a description of Nia:

NIA (Neuromuscular Integrative Action) is a combination of modern dance, Yoga, Tai Chi, Tae Kwon Do, Aikido, Jazz, and ethnic dance which provides a fun, well balanced fitness modality that leaves the body, mind, and spirit wanting to come back for more.

I've never taken anything like this so I'm nervous, but it sounds like a great workout and my fitness routine needs a serious face lift!  Anyone have any experience with Nia?  Any words of advice, or warning?