For the size, price, and piece of mind this piece of equipment provides, L&S ranks this at 5 stars, and stocks this product. With this rating, you can bet that us here at L&S have one in our packs or kits. This product vs. the competitors= this Rothco All weather books, have the competitors beat in the economics department. Same quality paper, but no flashy package. It would be nice to see a scale or conversion charts put on the covers but still works great!