How much work is it?
I don't know any teachers who are drowning in free time. So, you're justified in asking "how much time will I have to invest in this?"
The short answer is this: it's not no work. Expect to invest a few minutes learning how this works. And, you'll have to add vocab to each group by hand: it has no way of knowing what words you've taught.
Once you've done that, though, there isn't a lot of effort involved. If you teach a word that I haven't taught, you might be asked for a definition. And, even more, if you want to personalize something for one of your classes, you'll have to do that by hand. Even so, expect to have personalized worksheets finished in less than five minutes and, later, review activities at the click of a button.
My philosophy in creating this was that learners can tell when you don't invest any effort. So, instead of eliminating effort from worksheet generation, the goal here is to maximize the return you get for your effort.
advantages for learnerswhat's it do? advantages for teachers