I signed up many years ago when they had 50% off and then was allowed to renew at the same price. Made it very difficult to cancel, knowing that I will have to pay full price if I ever want it back, but one year I looked at how much I had paid in total for reading those books and decided to cancel anyway.

Great site though. I never used the app, but mobile browser support was not bad.

Paid for it to read computer books, and did a lot of that, but also discovered much else. They also had (have?) courses and paid video presentation. I noticed one series of videos I watched there would have cost more to watch legally than I paid for an entire year of O'Reilly.