I was looking a setup to let me make music sitting down and standing.
I have a System 1m and a Maschine Mikro, this externsion combined with two Roadworx Stands got the job done.
I have the System 1m in the lower rack, the Maschine in the upper rack and a Thomman Laptop Support where I put a 37 keys Novation. Perfect.
The build quality is good and the instructions to build it are very clear.
The final weight is about 7kg, not very handle to transport, but for using at home I have enough stability and high enough to suit my needs of standing up or sitting down while making music.