DIY kits for leather repair as Mike says have been around for a long time and they never seem to improve!!!
The pigments supplied are generally inferior than the ones professionals use and the results can be anything from bad to appalling :

- we send techs out on many a job to fix DIY disasters. Unfortunately sometimes the damage cannot be fixed.
Generally speaking a DIY repair or recolour (yes some people actually recolour their whole suite themselves) will not last very long because the methods and products have to be fairly simplistic and this leads to problems.
In this case here the products require the removal of the factory finish. This is totally unncessary with todays modern methods and a disaster waiting to happen as this creates a very unstable base for applying new pigment.
DIY kits also rely heavily on the customer knowing the type of leather they have and whether their problem can be fixed by simply covering over it - this is a minefield in the range of leather finishes that there are on the market today. They can simply buy a kit and think that this will resolve the problem without understanding what the problem is.
I suppose this is a bit like people who hire carpet cleaning equipment they are probably never our market but if you get trained there is plenty of work out there fixing what goes wrong!!!!!!!!