I just checked, and I've had an O'Reilly account since March of 2014 without major interruption, back when it was called Safari. It is by far the best source for high quality tech content out there. There is so much filler content in tech blogs, that I'm happy to pay to get access to high quality.

I must be on some grandfathered plan though, as I'm not paying near $500/year. That is a very steep price.