Correct me if I am wrong, but it seems like Yoga has become a "fad" in the last couple of years than just a great form of meditation of exercise. A lot of new studios open all the time and they all try to offer something "trendy" to stick out from the pack.
Gilbert Yoga truly deserves the 5 starts that it constantly gets because its the essence of the legit 'old school' yoga. Its incredibly unpretentious, simple and focused on the exercise itself. The teachers are caring and very relaxed, the rooms are nice and kept clean and their schedule is filled with different classes to fit anyone's crazy agenda. I am a big fan of their 6am M-W-F classes (when I managed to wake up that early) and their 7pm hot yoga class.
They offer classes for pregnant women and children, as well as different temperature rooms and different yoga types. I am a big fan of their "donation" system- every class has a suggested donation of $12. Whatever donations they collect goes to the teacher giving that class. They have it as a donation (instead of fixed price) because they believe all people should have access to yoga regarding of their finances. They don't want people to miss out because they are $12 short.
If that's not zen, then I don't know what is.