The seat is good and it protects against moderate rain enough. When it rains more should the case be "upside down" worn so does not enter from the top via the headphone port water.
The operation of the mobile phone in your pocket is so-so. Press symbols is not a problem but dragging and moving require some patience. Good enough for me but totally, because I hit anyway only to start the corresponding app before starting up again.
Unfortunately, the pictured Kopfhörerhalter and the "specialist" for keys are not used meaningfully. But the headphones I have the ear and the key on a chain around his neck, so there is no need at this point.
Its core task, namely to hold the phone on the upper arm reliable, this bag does excellently.
