I tried the intro course and just LOVED it! It gets you to really move, so the cardio is there, you work your leg muscles differently than with other forms of exercises wih the back and forth, and the arm holding the sword works too - that things weighs just under 2 pounds. Hold it up, arm extended for an hour and boy, do you feel your lower arm. The only drawback is that you never switch positions, so you just work with your right arm and right foot forward - with kickboxing, weights, etc., you tend to do one side, then the other.
But the most fun? You get to play with a sword! Bwahaha!
So for the next class, you need your own equipment, at the very least the rapier. I got me this beauty: http://www.kultofathena.com/images/SH1024P_4_l.jpg as well as shoes, small sneakers basically, with a rather flat sole so you can be nice and light on your feet.
Next, I'll be getting a jacket and a mask like these: http://www.zenwarriorarmory.com/catalog.php?item=255&catid=39&ret=catalog.php%3Fcategory%3D39