At the top
The product frees up space on the desk and illuminates the workspace perfectly without reflecting on the screen.
I use it for photo and video processing, so there's less impact on the screen than with a conventional lamp.
At night, using it reduces eyestrain.
I prefer the USB power supply, as it allows the cable to be completely hidden behind the screen if the latter allows a USB connection and saves a 220V socket on power strips that are often heavily loaded.
I also like the sleek design.
The slightly high price is justified by the quality of the product and the service provided.