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A lot of schools including my alma mater has this free for students/staff. They also allow alumni if you bought the lifetime alumni pack when you graduated which was $300 and included a bunch of other university services.

I have use the safari books extensively, but their book viewer sucks. I wished it was a much better UI.

I believe that your membership to IEEE gets you access to Safari Online also.

My employer also provides this. I like when i need to fully understand the inner workings of some new thing... which occurs once every 5yrs or so...

for day to day stuff, a web search is much more practical... and you get helpful comments on the page most of the time