Bill Kinney and Karen Smith from Harmonie are SM owners who sailed a 54 up from Florida to the Chesapeake Bay with the owner earlier this year.  Blog post here:  https://fetchinketch.net/2020/05/17/compare-and-contrast-the-amel-54-vs-the-super-maramu/

Joel Potter owned both and has shared his thoughts on the subject on this forum several times.  Here is one I found:  https://amelyachtowners.groups.io/g/main/message/44201


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Mark McGovern
SM #440 Cara
Deale, MD USA