If you are looking for a product that is faithful to the B/X rules and presents them in a way that is easy to digest and read, then this product is a five star product.

However, if you want the feel of the B/X rules but some tweaks to improve them a little then you won't really get that here. For example, the RAW B/X rogue is kind of useless because the base percentages for the thieving skills are so low. It would have been easy for the designer to tweak those to make them actually useful. Of course as a GM it's not that hard to houserule, but I do like it when the designer takes time to do some of that work for me. That being said, I don't really think that was the goal of this product, so I can't really criticize it for that.