Fedex delivery is fast but not very practical. In contrast to the product any worries he meets my expectations with a solid and stable construction (remember to tighten all axes once set). Just remember to make sure you have the square, about 10 cm under the desk for rods protruding a little.
A single flat, vertical use of a screen can not stick my two screens there is always a space between the two, but in most cases I think it will not be a worry.