I have SN but i find it hard to use. Apply on the hood, leave it for few minutes and wipe off. But it then left me some blurly swirl so i took out my Souveran and finished the rest of the car.
I tried it on the silver merc w203 just about two weeks ago, it was easy to apply and also leave a nice glossy shine. But still have a full bottle of opti-seal... :(