Granted, I was very skeptical about what to expect if the not inconsiderable price of a plastic lid. From the DSLR we know that with the lens cap: from, pocket, photo, session end, turn again. All good. At least with lenses with filter size> = 58mm.
For system cameras like my new OMD EM10 going though the same way, though not so simple. Why? Everything is simply less! Or even too small?
Who has large hands and fingers, which has a reasonably adept Bildermacher the small cover course quickly but just as quickly as he glides through the feet and lands (at best) on the ground, or (at worst) in Gulli.
And for exactly this purpose, this expensive plastic Remedy! It simply remains on the lens (in my case the kit 14-42mm), since it opens automatically when the camera. By fixing with screw on the filter mount nothing can fall. This is a comfort as with a compact camera.
Conclusion: The price is very high, opposite the material value diametrically, the function value but adequate!
Therefore: buy recommendation!