Have you tried a search on aqualink in the upper right corner? I just looked and there are a lot of threads discussing it. Maybe that will help to answer some of your questions.
Other models of the Aqualink are common, and there is lots of experience with them. But the Z4 is brand new and you are the first one who has even mentioned it, let alone seen one. A number of us would be happy to comment on Aqualink generally, but we just don't know anything about the Z4 in particular.
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