My experience with the aftermarket leather repair kits has been a tad disappointing. The dying process fades with each cleaning and in time fades away again with more original color gone with it.
A case of the cure being worse than the illness. If you treat your leather kindly, enter and exit the car being cautious of that area, then you should have very little wear and tear in that area in the future.
Also, I tell me clients to move the seat all the way back when exiting the car and this way they do not have to press their bodies that much against the side bolsters, thus creating less friction. The same goes then for re-entering the car. The friction of getting in and out is what causes the cracking and color fading, that and improper cleaning and conditioning.
Lastly, for those of you who are professional detailers, tell your clients (or wives, girlfriends or even boyfriends..Ewww) not to spray cologne, hair gels and hair sprays while sitting in their cars for the overspray from these products can and do settle on the leather, especially the head rests, and cause the leather to dry out prematurely. Had a lady who always sprayed her hair down and her Merc. SL's head rest was wasted by the time I started caring for the car. So I shaved her head.
Anthony