I participated in the speed interview process for the photographer assistant position, and I actually really enjoyed it. I believe there were four interviewers and four interviewees. We spoke with each interviewer for five minutes and a bell would ring and we'd go to the next one. Each interviewer had a different categories/set of questions. This was clearly to see how you interact with different types of personalities. I really liked everyone I interviewed with, and I really enjoyed the company culture. I felt totally comfortable and confident about my interview, so I was surprised and disappointed when they contacted me a few days later to say I didn't get it, without offering a reason. Having said that, even though I didn't get the job, it was one of the best interview experiences I've ever had and I wish it could have lasted longer than 20 minutes.
A few things of note: I originally applied for this position in September of 2011. They didn't reply until November of 2011. In December, they had me fill out a long form application and take a personality test. I didn't interview until January of 2012. It was quite a drawn out process.