Pros
Very well known brand that allows access to clients who are top companies in their industry verticals. The firm is into virtual office so you the ability to work from just about any location you want (I once went almost two years before returning to my assigned office location.) Lots of opportunities to get firm sponsored education to meet CPE requirements.
Cons
Expectation to work long hours with little chance of getting bonus or other compensation (except for "hardship bonus" on long term out of town assignment.) Your time needs to be accounted for in 6 minute increments and there are penalties for not meeting your billability targets. The partners in my practice came through the acquisition of another firm and they completely trashed the existing practice. If you were not part of the acquired firm you were treated as a second class citizen and relegated to second tier clients and tougher travel schedules.