Bought this 3rd level extension to finish my K&M 18810 setup. Quality steel, fits perfectly. Feels like it will last decades like any K&M products I purchased so far. The only thing I regret is not buying the complete 3-level setup from the beginning.
Fits Korg Monologue and my little laptop nicely widewise. Monologue bottom front part is not flat, so the ~1.5cm tall stopper it’s not fully protective from sliding the Monologue down from the plate. But laptops, other midi keys and synths fit and sit perfectly.