Build quality is what you'd expect from K&M, everything feels well-made, the rubber pads stick as they should, support leg works - absolutely no complaint there.
However. If you want to put a deep case - i.e. Doepfer - here, note that you need to tilt the stand back a fair bit, because the stand balances on the bend of the steel plate at the front, and the leg at the back. It will tilt forward unless the case's centre of gravity is behind the bottom of the steel plate. If you tilt the stand back far enough, this is not a problem.
The cutouts at the back plate sides fit a 6U Doepfer case power switch/mains connector perfectly.
I suspect this stand could hold a 9U case easily, but haven't tested myself.