The Olympus Sun visor snaps easily and are sufficiently strong.
It should be noted that the locking mechanism is very graziel and should be placed with a lot of sensitivity. For transportation you can sit up conversely, the lens ring is simply at home.
In no way the stability with Nikon SB for DSLR`s comparable.
The Sigma 60mm f2.8 for (for MFT) free included SB is mechanically much more stable and easier to handle.
The price of the stock is fierce and the decision lenses (for MFT) principle to provide without any additional accessories is quite brazen in my eyes.