They have the best Benefits package I've ever come across.
Because of their focus on the work, for some, work/life balance can become blurred. But the company will work with you on getting that back in to focus if you want it.
Many have been able to move departments/jobs based on their interests. The company has helped with education.
They compensate their staff well.
Many appreciate the extra activities that are provided - TGITs, Christmas parties, etc.
Employee loyalty is rewarded.