I've been attending classes at Express MiE for a few months now and I really love it. I don't think I've taken a class I didn't like.
My favorites so far have been Nia, Yoga Booty Ballet and Glee with MiE. But in all the classes, the vibe is positive, it doesn't matter if you don't get the moves quite perfect, and it's just simply a lot of fun.
Some classes are definitely harder than others. Dance Sculpt will get your muscles burning and I took a cardio class that included running, jumping rope and a gazillion squats. So there really is a class for every girl out there. If I'm looking for a more intense workout I just take two classes - they're only 45 minutes each so two classes won't eat up too much of your evening.
They change their schedule every six weeks or so so there is always something new to try. And all the classes are scheduled online so it's easy to know what's coming up and keep track of what you sign up for.
If you're looking for a fun way to workout try this place out. It's way more fun than a treadmill at the gym.