Some further plus points are that it: a)does not add more than a millimetre or two to the dimensions of the phone; b)has an approx. 2 mm. protective raised ridge around the camera; and c)does not get in the way at all when using the camera, unlike in the case of the flip style or book type covers.
All the keys on the right side of the phone all fully covered and this results in a slight minus point only with regard to the camera shutter key. It makes it rather difficult to gauge (and will take some getting used to) the amount of tactile pressure that must be applied to press this key which has a very delicate and sensitive two step (focus/capture) movement.
Other than for this minor drawback, would recommend this item to anyone wanting a quality back cover for their Lumia 1020.