I've got a LuvTab faux leather brown. It has the auto on/off magnets, you can fold up the front cover to make a landscape stand and it looks quite nice.
It has been causing me an issue for which, until I worked it out, almost had me returning my Nexus 7. I think the magnets in my cover are probably a bit too powerful. I would open the case and fold it round the back, the screen would come on, I'd enter my pin, the screen would go off with a click, and this would be repeated over and over. Took me an age to figure out it was just the case causing it to auto off. Why auto off seems most sensitive just after entering my pin I don't know but it's easy to avoid now as I just don't fold the case flat till after I've entered my pin and it seems fine.