If your seats are OE, then you should save your money. OE leather used in cars is coated in plastic (I believe it has something to do with flame retardants and stain resistance). My friend is a custom upholsterer (who until he died a couple of months ago did extensive work for Recaro, Lexus, Honda and BMW on all of their show cars) and he told me that if I wanted that smell and feel that I would have to change the leather out completely in my C4 and my Viper. Even the American cars that come with Connally leather options are coated (which is why that leather smell is missing).
All of those years that I used Lyxol was a complete waste of money....:cry
If you have a pre-70's car go ahead and use the leather conditioners. Plain hand soap (like Ivory) and water was the best cleaner for untreated chambrae leathers (a fine glove leather) as long as you wiped the soap clean and left no residual. Don't used sadde soap unless you want to strip the leather of most of it's natural oils. It should only be used when you have a very bad stain and you've exhausted the milder cleaners... or if you have a saddle.:crazy