I've used sci-hub a few times. It's a little buggy and not every article can be accessed, but it works well enough to try when I'm not on campus. $30 to read a single article is ridiculous anyway and presents a barrier to scientists who don't have, can't afford, or don't want to pay for access. I hope sci-hub stays up and improves for some time.
Shouldn't the public have free access? We paid for them.