As others have pointed out, the quality of the translations is fantastic but I also really appreciate some of the features it has. For example as a paid featur

As others have pointed out, the quality of the translations is fantastic but I also really appreciate some of the features it has. For example as a paid feature it allows you to switch between formal and informal speech, which can be really important in some languages/cultures. Another is that it can translate PDFs while preserving formatting. Not perfectly but pretty damn good. Yet another is that you can click on specific words and get more specific definitions of them, like a dictionary entry. This can be really useful if the translation seems ambiguous and you're wondering which sense of the word is being used. They also have another product, Linguee, which is a multilingual dictionary. It's really good and usefully, contains real-world examples with their (human) translations.