I tried this yoga studio in Squirrel Hill for its location. It is conveniently located on the bus line (on Murray!). At this location, they usually have 2-3 classes offered each day, 7 days a week. Unfortunately, most of the classes are unsuitable for those of us who work long hours. But that being said, I made it in for several classes.
The instructors are hit or miss - but that is depending on the style of instruction and yoga that you prefer. Even the miss aren't bad, just a style that was different for me personally. I would definitely check out several of the classes and instructors on different days to see what appeals to you and then stick with them.
It's $15 for a walk-in class and the price is lowered to $10 or less per class if you buy 4+ class packages.