So, if one carries out the installation yourself, you should have a little "Craftsmanship", then the lack of instructions is not a problem.
I bought this product because my old shower rod has finally given up the ghost. Removing the old screws and prepare the tool, lasted longer than the reassembly.
It should be noted that a Imbusstern or a broad screwdriver is needed to tighten the connection "union nut of the mixer at the lower end of the pipe". Since the insert must not be screwed to anyway (rubber seal) extends a slight increase, so not 100% accurately fitting tool is really necessary.
Otherwise applies as always, everything to do with seals has not overtighten, to come after sealing -> seal broken.
Shower and hand shower fulfill their duty and my women are very pleased that now a rain shower is available. Since I live in a rented apartment would be expensive not come into question.
I'm satisfied and if the thing alive for more than 3 years, it is worth their money.