I have had rubber mats for the bed bottom before, as well as drop in liners, and each has its pros and cons. After reviewing the various bed liners available for my 2012 Dodge Ram long box I chose the DualLiner. I am happy with it, the bottom mat is thick and has good grip that keeps cargo as well as people from sliding around on a slick surface, and in my opinion thats basically the main benefit over a one piece drop in liner. The tailgate needed mounting holes to be drilled in it for the liner to attach to it, and I took my time getting everything lined up nicely, otherwise it could be installed in a shorter amount of time than I took, which was probably 1-1/2 hours.
The rigid panels for the box front, sides, and tailgate were not trimmed evenly and symmetrically on the edges, mounting slots and holes, but all things considered the product is quite good in my opinion, and should perform its function well. Although I believe there is some room for improvement, I would still buy and recommend the product. The delivery time was very good, I was happy with that as well.