Its a national bestseller, so you can expect it to be a good read. What I want to add is I like the writing style of Chetan Bhagat. He is an IIT and IIM alumni. He can make you hooked to the story. The language is easy and the story is very interesting. It will take you back to your college days, the hostel, the ragging, professors, exams and the friends.
The story is of 3 college friends and their experiences in IIT. The film 3 idiots is not following this exact story line. So if you have watched the film already and heard that it is based on this story, then also you can give this book a try and it wont disappoint you. Its pure fun. In short a satisfying read. Thumbs up.