Probably every language learner knows these books. I like them and read a lot of those graded books. I was fascinated by them until I reached a certain level. It was around the time I caught an upper B2 level when I got bored of them. They weren’t demanding enough, and I switched to regular books or newspapers.
My personal advice: Give them a chance and try it out. But don’t be afraid to start reading a «normal» book, especially when you’re getting to a higher level.
