I use it almost everyday, it's even more convenient to search an article in Google Scholar and then download a paper thorough Sci-Hub, than to use Scopus.com or Web of Knowledge's search engine.
Do you search by article name or DOI or link? I prefer DOI, because, I guess, it easier for the engine to find a paper. In 95% cases I find a needed paper by DOI.
A digital object identifier (DOI) is a serial code used to uniquely identify objects. The DOI system is particularly used for electronic documents such as journal articles.
