Pros
They pay well. Personality-wise everyone was nice to work with. Corporate believes they are doing right by their employees.
Cons
They seem to discourage out-of-the-box thinking. Additionally, don't expect to have a job once your contract ends.
Upper management loves to make promises. In my experience I could not trust them. Generally speaking, every promise made was not followed up on. In some cases it felt as though they outright lied to employees, attempting to keep people engaged.
Also, since they have no intent of keeping most folks long-term, there's no incentive to grow their employee's skill sets. Don't expect training budgets. Expect your skills will grow antiquated unless you keep them sharp on your own.
Finally, due to size, and a hunger to compete with the big-boys, they take on contracts simply to grow their portfolio. Never mind the quality of the project. Beware, you could be placed on a contract doomed to fail. If that's the case, don't expect upper management will do much to right the ship, until it's almost sunk. You'd think it would be in their interest to salvage business relationships. That doesn't appear to be the case.