I love these Boost Your Russian adapted readers. If you are looking for Comprehensible Input (which I was and am) these are perfect. For an American, the Tom Sawyer stories are probably familiar to you, but even if you know how the stories go, they’re great fun. And it’s even more fun when you’re able to read and listen to them in Russian. I’d say my language level is about a high A1 or low A2 level now. The highlighted vocab was very helpful to me, but beyond that, I don’t think I ever had to look up more than a couple words here and there. I’ve gone through three of these readers in total and am reading a fourth right now. My only criticism is that I wish there were even more of them available. I would love to see simplified books or stories of Lermontov, Gogol, Bulgakov, or others.