Advantage: protects the key to kick any screen in the pocket, and saves battery since the screen turns off when the flap closed. Fineness of the assembly.
Disadvantage: still protects much less that full protection pouch (which goes over the hull around the phone) in case the so might fall. But a full cover is bcp bigger.
Functionality of the flap / integration by phone:
Good: flip closed you can still listen to music on the external speaker (and helmet).
So good: you can not get it as to answer a call with the side buttons as the flap is not opened.
Price: if less than 20 euros, ok. If not too expensive.
I recommend if not too expensive.
