Using the IndRail pass for a good Indian experience

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Site61 tells a lot about the railways in India, and suggests some nice looking trips to do. One can buy an IndRail pass, and could travel around India by train say 15 or 21 days long.
Is there anyone with some concrete experiences? Are the trains worth the use, is it safe (feels it safe!?) and is the purchase of the IndRail pass worth it?
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Irctc train ticket booking facility, Indian railways provide many others benefits with rail ticket
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Katerina Holmes, Andrea Piacquadio, Andrea Piacquadio, Vanessa Loring