I just put a Luimoto cover on my seat. Very nice quality and looks great as per the pics on their site. They also have a product called "Gold Gel" which you can add for comfort but I don't have a problem with the stock comfort.
If you're thinking of doing this, be warned that stapling it into the 2012 seat pan is very, very difficult. Finally settled for T50 staples in an electric gun and even then not every staple went in first time. Very hard stuff. Don't bother with battery powered guns. Not powerful enough in my experience.
Having read the comment that "Spencer" claimed that the seat pan can crack, my experience is that it is baloney. I had to abuse the living hell out of it to get those staples in and not a single crack.