So, I think it is absolutely essential! And here is how I do it.
I know I sound as if I was hired by the company, I AM NOT. I am just a user of this program, and there might be other programs that are equally good or even better or cheaper or whatsoever.
Feel free to share any other experiences with reading programs. And of course if your kids go to the bookstore and get their own physical books that is also excellent. But extensive reading needs 1000s of books to choose from, in the right level, and this is something that you won't find in most libraries.