Had them on my 2012 and didn't get them on my 2019 only because I bought from inventory and it had every option except the Ram Boxes. I miss them. What I can tell you is they were a great option. They never leaked, never warped and people thought they were a unique option. I stored all the usual stuff in one side (jumper cables, hitch ball and D-Ring, military shovel, tools, gloves, etc.) and the other side I left open for groceries, takeout food, guns when going to the range and of course filled it up with ice and beverages for day trips, beach runs, etc.
Unless you pile up sh*t in the back you do not lose considerable space. It still allows for 4 x 8 sheets of sheetrock, plywood, etc.