I wasn't going to reply, but since the Symmetry is on the list.
I have the apple leather case on an iphone 5 for 1 1/2 years, when I got my 6, I got an apple leather case and the Symmetry at the same time.
The Symmetry is the best case I've ever had, just enough rubber to protect the edges, slim enough to easily slide in & out of pockets. It is not slipper in hand.
I especially like that it covers the bottom edge and doesn't that ugly
cutout on the back, which is nice for putting it face down on a table top, the rubber is grippy enough in these instances.
The leather case is still in its package.
Go Symmetry!