Pros
Everything the company name implies. Led by incredibly accomplished pioneers of multiple disciplines in a true innovation and invention culture. Empowered employees continuously given intense challenges on diverse projects. Wildly eclectic mix of projects, technologies, clients, colleagues and 'friends of the company'. Collaborative multi-disciplinary approach from scientists, engineers, designers, storytellers, researchers, analyst, execs so you're always learning. Really cool offices with no end of whacky technical toys and experiments at every turn, and more hidden behind closed doors if you're lucky enough to get access. Really an amazing place to work every day on envisioning and inventing the future.
Cons
Not for the faint of heart or lovers of consistency. You have to be ready for frequently aggressive deadlines, direct criticism of ideas or output, and occasional failures. Different project management methodologies from waterfall to agile to extreme to spiral to 'wtf?' so flexibility is a must, but that's not a Con for everyone. Not the best pay but makes up for it in inspiration, challenges and the caliber of people and projects.