What I love it for in particular is that it expands your vocab in ways that a book may not, or minimally adds an extra bit of "fun study" akin to casually doing

What I love it for in particular is that it expands your vocab in ways that a book may not, or minimally adds an extra bit of "fun study" akin to casually doing flashcards. For Greek for example, it does expose me to new words/grammatical functions that I maybe haven't gotten to yet in my formal book and then I can hop over to Wiktionary to see it's formal defintion/usage/declensions/etc... Like with any learning experience, you get what you put into it.