All I can say is it is incredibly useful, not just O’Reilly but they have got collections from a lot of other publishers. It is really useful as a reference or when you want to deep dive into something new. To top it, if you get to complete couple of books cover to cover, it is even better.

I can’t say whether it is worth the subscription fee. I have got my employer to cover for my subscription for the last 2 years, but not sure if I will be willing to pay it out of my pocket.