Great cost benefit
I bought the Thomann stand 18 month ago and I am still very satisfied with it. The Thomann stand is easy to assemble and stable. I mainly use it at home so I can't judge how the usability during a concert is.
It should not be used as a tablet pc holder. Due to the weight distribution my tablet once overturned and fell to the floor. Fortunately it didn't break. In general the stand has no problems with weight and stability as I am using it daily with a quite big and heavy folder.
Compared to other products: This stand has definitely the best cost benefit ratio. Other products in the same price range I tested couldn't satisfy in stability.