yeah - products like that are great for the short term "fix". they put a coat on the outside. they seal the leather. however, sealing is exactly what you don't want for long term life. for that, leather needs to breathe. it needs to absorb moisture. a product that seals, cannot do that. these also tend to make the leather a bit stiffer. i have used products like this, and they do look good, for a while. then, a couple of years later, it seems like almost overnight it goes bad. however, some people like the bit of shine they add, and the immediate change is desirable to them. i see a lot of people who show cars and sell cars use this kind of product.
products that are fat based get into the leather and remoisturize, but do nothing for sealing the leather, and tend not to add a shine. they also do not tend to make the leather "look new again". they make it soft and supple, but don't do a lot for the surface appearance.
nothing will make your leather last forever. leather wears over time. there is no avoiding that. it's getting worse with the new leathers out there too, as they are much thinner than in times past.
you have choices. different products do different things. it really depends on what you are looking for. basically you just get to choose between something that provides a long slow gradual decline, or something that looks good for a while, and then very rapidly degrades. either way though, the leather is going to fail in time.
94 Midnight Metallic Blue Cab Porsche 968 w/deviating cashmere/black interior and WAY too many mods to list - thanks to eric for creating
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"It isn't nearly as expensive to do it right as it is to do it wrong."