So why two stars?
Because from the same manufacturer of this tablet have forgotten a magnet to activate from sleep that's just unacceptable.
Because when making the triangle maintains this is the surface that is in contact with the screen that will be in contact with the table. So if a grain of sand or sticks to the surface, it may scratch the screen. And even this softer surface thus will mess quickly.
Returning to the rigging system: it is a kind of non-slip surface. For a low-cost cover that does not disturb me would have but for a premium a hidden magnet in the flap would have been more premium.