I have seen them mentioned a few times before (elsewhere) and I think the biggest negative is the weight. But if you have the space and don't mind that, go for it! I could see them being pretty useful, especially with a few minor tweaks.
I actually used one in the Army in the early / mid 90's. :p
Edit to add: I should point out some positives too (as my wife always reminds me)!
They are obviously well built and sturdy. Depending on how how you load it I would recommend thinking about further dividing drawers, or adding in some of that drawer matting on the bottoms, as stuff will rattle and rub. Some wax on the bottom of the drawers (you will see where they contact) will help them slide more smoothly.
If you grab one and start using it be sure to post up! I don't think I have seen people actually use one for camping yet, only talk about it online. :p