My studio offers a "Free at Three" class every Monday which is where people coming for the first time can come for free. It's not open to the general public, just first timers and a few experienced people up front so the new people can see good examples of the postures.
Yesterday due to some scheduling reasons, I took this class. I went up in the front row. Our studio owner, Stacey taught. She is absolutely fantastic dealing with new people, answering their questions, calming them down, etc.
It's a very unique class for an experienced person and I really enjoyed it. There were about 8 first timers and four experienced people. I definitely could tell the people behind me were paying attention to my postures and of course this gave me extra incentive to do a good job. It was a very low key atmosphere which I think is great for first timers. I survived my first class, but I was certainly intimidated walking into a room with 40-50 people who all done this before. I would have loved to do a first time class like this.
Hopefully I can do this again, it was definitely an enjoyable class.