Pros
Nice medical benefits, pay for health club, decent vacation. fun environment with lots of events. Really good opportunity for interns -- some with no previous experience come in and land a good job with a well known company. Additionally, if you have a good manager, there are opportunities to grow and chose different roles. Lots of drinks, beer in the office (kegs even). Lots of food from events. Fast paced and overall good people that are a pleasure to work with. Decent pay. They are growing fast, have multiple offices and a choice of Macbook or PC. The new office in Seattle will be a stunning campus.
Cons
Some departments are more toxic then others. There is existence of cronyism, politics and gossip. it is the first place I clearly witnessed pushing people out (making it miserable experience for individuals they wanted to leave). Remarkably, some less productive employees stay on board for years and float through the days. They do promote within, as per other review some of the managers do not have previous manager experience or were promoted when at Expedia to manager and sometimes director, having held much lower positions at previous companies. This of course can go either way - some seem well warranted others can be more perplexing. The new office in Seattle will result in a horrendous commute and won't help rent supply/demand = cost.