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I am using the Bob series to supplement my Kinder's phonics program. The books have just the right difficulty to challenge but not discourage. My Kinder LOVES them! My only challenge with books stems from my Kinder's ability to memorize everything very quickly. Plus the pictures might give too many context clues for us. Overall, we purchased first two sets and, once started, quickly purchased the remaining sets. Great product!
However, we have struggled with the Kinder and First Sight Word books. They contain enough "advanced" words that I feel we will not really be able to tackle the sight word sets until we have finished the reader book sets. The sight word sets do come with flash cards which is nice.
My daughter was about 3 and she was able to decipher words so i started with Bob books. Fast forward to 3 1/2 and she has been able to master this entire set. I think these books are really good but the only issue I have is that I don't really think these are for first graders. I think they would be way to easy for a first grade.