I use this case for 3 years now. I've mounted a various numbers of racks into it, and also my mixer on the top. Since my mixer is smaller, I've included a metal mount to sustain it, and also it remained a space for my rack compressor, which also stays on the top.
In the studio I have a large piece of polystyrene under it, to raise it a bit more, so I can comfortably manipulate the gear in it. It is easy to close it, and transportable, also if it is full of rack gear, it becomes more stable and sturdy. If one overloads it, must be careful at transport, because if dropped it may break.