i really wouldnt recommend putting any of these products that "feed" the leather. Just keep it clean.
Most of the leather in cars these days is full of plastic, and definately in our golfs. its probably the lowest rent leather you'll find! that means any products that "feed" it, just sit on top of all the artificial coatings rather than soaking in, as it would in traditional leather.
So when you sit on it, all that happens is that your arse shines it all up and it looks like a shiny mess!
Just keep on top of it with a mild cleaner.