Pros
Great mentorship, great career development such as trainings, certifications, education reimbursement. It is a good place to expand your skills and managers will step in and help you understand how to navigate tricky situations especially when clients are difficult.
Cons
Low pay. They tell potential hires about "the bench" and how you can still get bench pay when you're not billing at a client while they look for your next opportunity. Increasingly, they lay people off, sometimes after only a few days or right as you hit the bench. Often ask you to work beyond normal 8-5 contracting hours to contribute to the company after a full day of billable work or doing additional trainings on your own time (nights, weekends, using your own PTO). Quite often they paint a rosy picture during monthly internal updates, so you think you're on track for your full bonus payout and then when the year closes, they say other offices didn't make their numbers so our bonuses are lower.