I was going to reply "so worth it" but I checked my subscription - $399/year (legacy) now $499/year. I had gotten it when I was starting consulting and needed to read books per client projects, and could write off the expense for taxes.

Now, I'd have to say no. I read maybe one book a year. ( I "could" read hundreds, but in the end, I don't) I could buy the physical book, which I prefer, and 7 or so others and keep them, instead of a virtual library. Or get them from my public library. Or from archive.org.

The only advantage was the unlimited library and the auto-update of books from revision to revision. But your question has caused me to cancel the subscription.

If you can get it from library or university, I'd say it is -- but not unless you read a lot of books per year.