I first started going to Desert Song about a year and a half ago with the intro class, and I am hooked! Mary Beth is amazing and makes you feel like she has built a workout around you. The classes are always something different, so you get a good workout every week.
The into class is great for anyone just getting started or who needs a refresher. Also when you do the intro you get a discount on the first class set you buy and can drop into any classes in addition to the intro classes for only $10 the whole month you are in intro.
Stephanie is my favorite instructor because she works you very hard, but her classes have a great energy. I am really starting to notice an improvement in my balance and strength (I no longer feel like I am going to do a face plant when I go into cobra). Whether you are a beginner or advanced you should check it out.