I bought the SKB Roto-mould case but I sent it back - it was too flexible... and sagged at the top... All my other SKB kit is excellent but I wasn't convinced with the 4u case.
I swapped it for the Gator 4U shallow case and I couldn't be happier (the latches are attached to the lids, so no rattling noises!)
The hardcase in the photo in your post looks like the ultimate option for chucking into the back of a lorry but I find the Gator case light enough for one handed carry and built tough.