For the product itself the key is there: true dimensions, easy to assemble and set up, effectively obscuring veil, winding mechanism for now seamless and non-blocking (the most painful of these systems usually).
Some shortcomings: the two "Klemmfix" are difficult to install on a somewhat large door, and the plastic cord to unwind or wind the store is a bit "cheap" and the system is to tie him either not very practical.