I have 2 units from 2018, one in a horizontal position and one in a vertical position.
Silent motor. You can only hear the airflow. It started making noise from the bearings and the fan was not turning easily. This is understandable since dust sticks in humidity and becomes solid. I solved it, cleaned it, applied lubricant to the bearings, and reassembled it. It works like new! Excellent build quality. The only downside is the backdraft damper which is essentially a piece of plastic and does not do a proper job, but this is for someone who wants to block external air.

The fan has been working fine for me. It would be good to apply some silicone near the wire connections to make them more resistant to the moisture in the bathroom.

Vertical installation on WC. It does not bother much during operation. It performs quite well (removal of steam), without any prior experience. I would expect slightly better performance. Overall, 5.5 cubic meters of space. Air extraction at a distance of 2m.

Expensive for what it is. With use, the mechanical noise gradually starts to increase. It needs replacement in about two years.

Quiet, small but relatively powerful for its motor and with a discreet design and color. However, for difficult cases, I would recommend something more powerful

It lasted 1.5 years after renovation. In the first year, it started having problems with starting up and making noise, and after six months, it gave up. Stay away!