My first post, and it's a (hopefully) useful answer!
I picked one of these up the other week. It's quite a nice box, but certainly isn't going to hold anyone total Lego collection.
The box itself is about 30cm long and 17cm wide, and the top half opens to show you the inside. There are 4 trays inside, each of which stacks on top of the others in any order. Each tray is subdivided into different compartments, and each tray is different. So there's a tray of 20 small compartments, 16 larger ones, 3 big ones etc (numbers are from memory)
The whole box is not that strong, as it's made of cardboard covered in glossy paper (it reminds me of an IKEA product), but it's certainly strong enough to hold a full complement of Lego inside! I tend to use it as a portable carrier, containing parts for models I'm working on right now, or to carry parts from my main store in the back room to the lounge.
Overall - 8/10. A little on the expensive side, considering what it's made from - but good value otherwise.