I had a great experience interviewing with a very organized team and hiring manager. After a phone screen I was called in for two series of 4 hour interviews, meeting about 9 people in total. Along with making sure that I had the skills required for the position, the team was mainly assessing my personality and possible fit within a group.
If you are going to be applying for a position at OpenTable, particularly for a Product Manager position, be sure you are very familiar with the product and be ready to suggest features or improvements to the services they provide.
While an offer was expected, I was unfortunately unable to wait and took another opportunity due to personal time constraints.
I would strongly advise applying for a position with this particular team, as all members were welcoming and very knowledgeable.