Thank you gracevine and freiamaya for your helpful posts.
One of the key aspects of the Bikram series that I find appealing is the challenge of working hard while preserving inner calm (or at least trying to!). This helps build both discipline and focus.
Prior to joining my local studio I had no yoga experience so it is a constant (and enjoyable) learning process to appreciate and respect the customs that surround the practice. As a side note, while visiting studios in other cities it has been interesting to observe the fairly wide variance in tolerance for distracting behaviour during class i.e. coming in late, exiting, chatting, hydrating, etc.