Pros
They offer at least some training, and as an American consultant you will most likely get leadership experience leading an offshore team. It was my first position in the tech industry that wasn't independent. The expectations are never very high, so if you put any effort in to go beyond them then you will be given opportunities to do different things. The people are genuine and kind as well. Further, the company does pour a lot of cash into charity.
Cons
I worked my tail off trying to impress the suits, and for a time it paid off. Then my contract with my first company ended, and I had to start over, basically. This is to say that there is no guarantee that your work ever pays off. And in fact it probably doesn't. Write down what you do and put it on your resume, because it won't matter to TCS. Here's my experience with that: I was the most technically skilled engineer on my last project, and more than half of that project would never have been completed within the time frame if not for me. They were paying me well below what I should have been earning for all the tasks I was responsible for, and HR responded to that by giving a 3.5k bonus and a 2.5k raise -- both absolutely measly sums. Further, the career growth opportunities tend to be business-leaning, so as an engineer you won't want to stay more than a few years at max.