Summary: Bought them, installed them, and they seem to collect dust because I have to vacuum them off once a month, but it still gets dusty inside my case. It helps. It's cheap. I would go for it if you're wondering if you should.
Summary: This product is basically made of 2parts: a plastic honeycomb-pattern grille which forms the frame, and a fine mesh plastic filter welded underneath, it's the type of washable filter you would find in an air conditioner. It has a solid feel to it and should last a long time and could be easily cleaned by washing or vacuuming. The regular price is a bit steep though. Much better wait for a sale to buy it.
Summary: wie immer, mit Conrad problemlos repariert. Passt einwandfrei auf den vorhandenen Lüfter, jetzt wieder gut geschützt. Passte sich den vorhandenen Bohrungen gut an. Hat sich nun 3 Wochen bewährt.