I even got a result I did not expect: the bezel "stabilizes" the shots (I put it in quotes because stabilization is a big word in the world of video). Having pressed against a part of the body actually helps make them more fluid decision-views (either on the shoulder with a rig or on the eye with a viewfinder, as here, even if the result is obviously more flagrante with a rig).
The only negative point (which could be expected considering the price of this product) is: the fact it is rather wide limits access to the buttons on the left column (a D3200). Of course it also depends on my flat device, I therefore takes no star in sight for that!
In short: a great product that I recommend without hesitation and delivers everything an amateur videographer wants!