Pros
It is not your standard hedge fund -- in fact they don't even call themselves that. The company pays as much attention to the culture as some of the major tech companies like Google or Facebook and it shows. Things are different there. Personal development comes quickly if you are willing to dive in. Management is very open and trusting. They share more with employees than I have ever seen elsewhere.
Cons
The company is rather established, so don't expect to progress quickly. You will need to be there a solid 5 years to get out of entry level status in many departments. The company would be great IF everyone actually lived by the Principles - the book written by the founder that describes the ideal culture. Despite the mandatory training for all employees on this point, many people just superficially put up with the principles and don't fundamentally change their behavior. The place only works if you buy in and take responsibility.