Good functionality for the price.
The documentation is the biggest problem: hard to read and incomplete, but with some experimentation you get there. Contacting Amazon also helped.
As memory card I purchased
(you can only use 32 GB, that is SDHC), which works well. Datatransfer also to Linux not a problem (it just acts as a memory stick).
For charging you open the cover at the end with "USB" on it (the same slot is also used for the data transfer).
Concerning the menu: via "mode" you get into one of the three modes (video, camera, files), and in order to get to the setting-menus, you have to use the lever for the zoom (left/right).