Only problem so far is the volume knob that easily turns when bumped or rubbed. Makes for a nasty surprise when it goes all the way up next time you receive a message
Minor problem anyway.
Next games, I will tape it down with a small piece of electric tape just to make it harder to adjust it by mistake.
This might not be a problem to you depending on where you carry it (mine fits close to under my arm so it's easy for me to bump it).