I am using a KT, a Paperwhite, an iPad and an iPad Mini with Kindle apps. While 'last page read' syncs reliably, annotations, bookmarks, and highlights are very 'hit or miss' with the iPad apps (but not across Kindles - those sync everything reliably). Most of the time they sync... eventually. But not always, and rarely right away.
It seems to have gotten worse lately, but I have not done any formal testing.
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