Pros
TEKsystems is one avenue for finding an IT position which may be a quicker avenue than people who are stuck in the the "trying to get an interview" stage of job seeking, out on their own. It helps to have a recruiter trying to sell your skills to a client. Yes you still have to pass the interviews, but you may get more of those opportunities.
Cons
Once placed in a contracted assignment (this does not refer to direct placement employment), consultants may feel like invisible, unappreciated, disposable cogs at TEK although they are doing a fantastic job for a client. At no time did anyone from TEK discuss let alone congratulate my performance nor discuss any development opportunities with me. "Career growth" was of course non-existent. Communication, responsiveness from HQ regarding important policy issues and changes was virtually nonexistent. There is nothing in TEKsystem's practices towards its employees to cultivate morale, or a culture of trust or loyalty for staying with TEK. In fact the opposite was true and there were many unpleasant surprises that made me wonder how they expect to keep good people. I say all of this this as a consultant who completed a long term assignment with TEK and left the assignment at its natural end and left the client on extremely good terms and have no resentment about the end of it.