HI Yakky
The problem i had with 1Z was a couple of things. The cleaning action i found confusing, i could never work out when it had done enough cleaning. The towel would come away dirty, i would go back and re apply and then the towel might come up clean or dirty, but the thing was could i be cleaning off the protection from the first go or am i covering up dirt with more layers. I guess a dedicated cleaner.
Also, i found it became shiney quickly, as you say it did become matt. I presume, atleast in my enviroment (humid rather then hot, damp rather then dry chilling cold) that it was attracting dirt. Quicker then say when i applied a fluroprotectant (sp?), Leather Masters.
Thats just my experince with it. I posted before that i think Accumulator or someone else used to use it alot too and posted about and they liked it.
Judyb highlighted with the 303 product what i was saying about Leatherique. People who think they it does wonders are most likely benefitting from the cleaning action and then moisture going back in to the leathers. They end up appling oils which they wipe away or remain on the seats only to attract dirt and grime an end up causing more cleaning headaches later!
I notice on alot of the Pro posts, and not just on this forum how detailers use oil based products (conditioners) on coated leather after cleaning. Its like spraying a car with a clear oil as a QD, looks good for about a second, then all the dirt is going to attracted 10 fold.
Geoff