I know there are mixed reviews out there, but for me it works! I love that you can cancel at anytime. So during the months you don't have time to read that much, you can cancel it and then sign up when you have more time. It doesn't have have the latest new releases, but I have found some great books.
I use it in the classroom too! They have many great children's books. I can open the Kindle Unlimited eBook on my iPad and Airplay it to my class while I am reading it out loud. The students love seeing the big display of the book while listening to me read it. I have also read them a chapter book from their collection.
You should check out the available catalog. I am getting back to my mindless holiday reading for a day or two longer. I hope you are enjoying your break also!