You need to check your filter screen daily. When it's dirty, you need to take it out and clean it.
The filter screen is up inside the head where it's hard to get to and hard to see. This mirror makes it very easy.
When you're cleaning up, simply take the mirror and put it on the drip tray (as shown). This gives you a very clear view of the filter screen up inside the brew head without having to contort yourself. You can see the screw, and could easily unscrew it without having to bend down.
The mirror has a hinged handle to make it easy to get whatever view you'd like - it's also easy to inspect the gasket inside the brew head.
Mirror face is 3 inches across with a solid 5/8" rim, and a convenient handle that folds. Easily fits in the appliance drawer with your other espresso machine tools.
A must have! Makes you wonder why so many people contort themselves (and/or don't check the filter screen with regularity).