I really don't know what to add to the title. It fits on the product that it is meant for, and I quess it offers some protection. Not as much as a case would do though. And of course it won't protect much against fluids, as it's open on the bottom and sides, including the USB connection points. Which has an advantage besides the disadvantage of vurnerability: You can keep the plugs in.
I think 38 euros for a piece of plastic is quite a bit over the top, €6 or maybe €8,- would be more like it. But I'm glad I can keep the dust out. I guess an old thick sweater would do the job for free on travels, and a cloth will do on your desk. But then some people don't like old sweaters or cloths to sit on their desk.