Questions for long time Zaino Z9 and 10 users

I have been using Zaino Z9 and Z10 on my leather seats for around a year now. I have been worndering how good the products really are at preventing leather from aging and wearing 5 or so years from now, or if it will keep it looking like new still. What have you all seen that have been using Z9 and Z10 on your leather for years? Does this stuff really keep the leather from drying or aging out? I want to keep mine in perfect shape for many years to come and I just want to see if this is the best stuff to be using
 
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