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Its not the link from the 7z1...I think this one is the good one
AFAIK, that is the OE link which comes with the 7Z1, and it's the one I think is shit. Obviously your experience is different, but for my money the Snap On link is the work of the devil and should have been drowned at birth. The only advantage over a proper spring-clip link is that it is compatible with a 5-speed dérailleur, but anybody using a 7Z1 with a dérailleur is deranged anyway.
Its not the link from the 7z1, they are difficult to open again.
I think this one is the good one:
(sold out) https://www.bike24.com/1.php?content=8;product=184236;menu=1000,2,83;page=19
I bought a whole bag of them from somewhere.