Same experience as another poster, the person who was with the HR rep did not introduce themselves. She started the interview by mentioning she needed to leave soon for a call. Gave me a new logical question but did not offer any feedback on my proposed solution (since brain teasers are often designed to test several reasoning factors i was surprised that no explanation was given). I left after she could not explain how they priced the product and kept mentioning that there is no such thing as a boss there since they are a flat company. That should not be an excuse for lack of procedures or being able to explain how a department is run or how targets are set. On the plus side i spoke with a few poeple on the floor while waiting for the interview to start and they all seemed happy. Since one mentioned they more than trippled in size in 1 year I was not surprized that the interview was unstructured.