Missed it ...

Guided by several days of research and comparative, I finally set my heart on this model.
Wifi, automatic two-sided, modular touch screen, cheap ink cartridges, 5-year warranty, in short a priori that good.
Unfortunately, I ended up throwing in the towel after three days and as many tantrums that moults customer service calls, unable to solve my problems (and better not say more ...).
First, the bins are not totally A4; it is thus necessary to position the paper on the pins in the tank bottom, which is also mentioned in any test, or in the manual or by the customer service ...
Unfortunately, this causes a defective paper feeding, with a number of sheets fed each time.
Secondo, impossible to perform automatic duplex as systematic stuffing paper.
My model was may be faulty on this, but the problems of paper trays is well within a design error, in my view unacceptable.
In short, it is better to try it before you buy.
For my part, I will use my right to withdraw and go elsewhere.
Shame, in any case, given its other features.