My Take
I think it is a great tool for teachers who are in schools with low tech. For those who do have the tech Read Works can also be read and worked on from a computer as well. I like it more for their informational texts. Their fiction texts are more Juvenal than I like, but for everything else it is solid stuff.
How I Use It
I use it as a homework and with it's paired readings it really lets students compare and contrast two different texts.