The K&M 18810 is not fancy but it is really solid. Nicely overbuilt even. The stand itself is clean and pure function but it could have been improved by some basic cable management. The stand is not highly portable - but it is a rock-solid and practical foundation if you're not gigging with it.
I have a fairly heavy Kawai MP11 88-key piano/controller perched atop this K&M stand - and it is extremely well-supported.
As far as the layout of the slots for accessories (2nd tier, mic boom, etc.): you will have about 74cm total spread between 13 accessory slots,each spaced about 55mm apart. I would have liked a little more extension so that the accessory slots could be a little wider, toward the edge of an 88-key keyboard; however, the design is still really practical, easy to setup and is fairly flexible.
The height-adjustment knobs are well-designed with positive feedback locking mechanisms. Once securely in place, nothing is going anywhere until you want it to do so.
With a big & heavy keyboard, once the keyboard is in place it is impossible to adjust the horizontal positioning of stand accessories without removing the keyboard from the stand to access the mount points. That might be obvious but it's something to consider. Don't let the hired help leave before the job is done!
I do think this stand could have used some basic cable management (hooks, channels, etc.). The stand arrived with some hook & loop straps which do the job but the appearance could have benefited from proper cable management.
Thomann did a fantastic job of securing speedy and courteous shipping.