Its ok for me that leather looks used after a while, but it should not look used right from the start. Means, no when I bought my Smart Cover it did not look used, but after using it for two weeks now without handling it with care it does
Still would go with leather, it just feels better then the silicone ones.
Oh yeah I definitely prefer the leather Smart Cover, its super nice.
I went ahead and ordered a new saddle-brown cover from Apple. I'm just going to compare it and send the (what appears to be used one) back. I don't feel like going back to the store "again", this would be my third trip.