Pros
Concur has the best overall balance of any job I've ever held. The benefits are great and fringe benefits even better (hot breakfast every Monday morning, massage chair that rivals the real thing, dedicated ping pong room, pool table and fooseball in the kitchen, full locker room facilities for those that ride their bikes in, flexible work hours, paid maternity and paternity leave, etc...) the pay is competitive, and the management does a wonderful job from the top down. Everyone knows what direction the company is going in and if there are changes we are well informed.
Cons
Parking is bad unless you get here really early or tele-commute. Being located at the end of 520 doesn't help much with rush hour traffic. If you've been a professional job hopper you might find yourself in a position you don't want to leave.