Pros
DW hires a lot of recent grads, and as a brand-new employee you get real assignments with clients pretty much from day 1. It's a small company, so you get to know everyone and learn from your more experienced peers. This is probably a good resume builder.
Cons
DW is trying to figure out what it wants to be when it grows up. It has big league aspirations, but it's not there yet (despite the PR). There is some politics and the culture isn't the healthiest. The people practices are far from world class. For more experienced professionals, you'll get lots of autonomy, but to the point of abandonment and unclear direction. Your innovative ideas won't be warmly embraced unless they lead directly to sales/revenue; instead, you'll be expected to toe the company line and deliver.