My entire modular rig is built around these cases. I have 11 of them. They are sturdy and dependable. The power supplies are rock solid. Doepfer offer fantastic support.
The only thing I would have said that was a 'Con' was that the power rails weren't idiot proof in the early cases (it was possible to plug the modules in incorrectly as they were just naked pins)
However, the last 2 I purchased have fixed this, with connectors now being sheathed in the common protective shell to stop you frying your modules.
Ace. Great case, now even better.