There is a decal on the drivers side of the dash you will see it when you open the door. It warns about the use of aftermarket seat covers. It could play havoc with the air bags in the side of the seats.
I use this stuff on my leather seats, it is nice, gives it a glossy finish, and isn't too gross: Meguiar's Canada
The one I have is the pre-moistened wipes rather than the spray. I find I can do all the seats with 2 or 3 wipes.
First time you sit on them, if you then go and sit on a leather seat in your office, you will slide around a bit, it is kind of fun, but as far as I can tell, did no damage to my pants. I'm sure that if you wipe down with a dry cloth after you apply, it will reduce that effect (and the shine).